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Schedule III - Real Estate and Accumulated Depreciation Section 13 (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 $ 1,529,057,000      
Land 2,786,282,000      
Buildings, Fixtures and Improvements 10,186,554,000      
Costs Capitalized Subsequent to Acquisition (33,607,000)      
Gross Amount Carried at December 31, 2019 12,939,229,000 $ 13,592,440,000 $ 13,577,700,000 $ 13,539,921,000
Accumulated Depreciation (2,727,099,000) $ (2,622,879,000) $ (2,217,108,000) $ (1,766,006,000)
Albertson's [Member] | Denver, CO [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 2,058,000      
Buildings, Fixtures and Improvements 5,286,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 7,344,000      
Accumulated Depreciation (1,573,000)      
Albertson's [Member] | Los Lunas, NM [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,105,000      
Buildings, Fixtures and Improvements 4,770,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 5,875,000      
Accumulated Depreciation (1,743,000)      
Albertson's [Member] | Midland, TX [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,002,000      
Buildings, Fixtures and Improvements 9,885,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 10,887,000      
Accumulated Depreciation (2,944,000)      
Albertson's [Member] | Odessa, TX [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 947,000      
Buildings, Fixtures and Improvements 8,867,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 9,814,000      
Accumulated Depreciation (2,610,000)      
Albertson's [Member] | Weatherford, TX [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,820,000      
Buildings, Fixtures and Improvements 5,771,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 7,591,000      
Accumulated Depreciation (1,780,000)      
Albertson's [Member] | Tucson, AZ 2 [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,642,000      
Buildings, Fixtures and Improvements 3,587,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 5,229,000      
Accumulated Depreciation (1,129,000)      
Albertson's [Member] | Las Cruces, NM [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,588,000      
Buildings, Fixtures and Improvements 5,719,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 7,307,000      
Accumulated Depreciation (2,158,000)      
Albertson's [Member] | Bossier City, LA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,949,000      
Buildings, Fixtures and Improvements 5,125,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 7,074,000      
Accumulated Depreciation (1,568,000)      
Albertson's [Member] | Tucson, AZ [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 2,710,000      
Buildings, Fixtures and Improvements 7,704,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 10,414,000      
Accumulated Depreciation (2,360,000)      
Albertson's [Member] | Fort Worth, TX [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 2,146,000      
Buildings, Fixtures and Improvements 4,678,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 6,824,000      
Accumulated Depreciation (1,499,000)      
Albertson's [Member] | Mesa, AZ [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,944,000      
Buildings, Fixtures and Improvements 4,145,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 6,089,000      
Accumulated Depreciation (1,270,000)      
Albertson's [Member] | Phoenix, AZ [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 2,456,000      
Buildings, Fixtures and Improvements 4,628,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 7,084,000      
Accumulated Depreciation (1,405,000)      
Tractor Supply [Member] | Little Rock, AR 7 [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 1,500,000      
Land 930,000      
Buildings, Fixtures and Improvements 2,035,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 2,965,000      
Accumulated Depreciation (501,000)      
Tractor Supply [Member] | Jefferson City, MO [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 1,125,000      
Land 490,000      
Buildings, Fixtures and Improvements 1,877,000      
Costs Capitalized Subsequent to Acquisition 98,000      
Gross Amount Carried at December 31, 2019 2,465,000      
Accumulated Depreciation (389,000)      
Tractor Supply [Member] | Franklin, NC [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 1,479,000      
Land 434,000      
Buildings, Fixtures and Improvements 2,629,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 3,063,000      
Accumulated Depreciation (646,000)      
Tractor Supply [Member] | Sedalia, MO [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 1,090,000      
Land 480,000      
Buildings, Fixtures and Improvements 1,782,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 2,262,000      
Accumulated Depreciation (458,000)      
Tractor Supply [Member] | Lawrence, KS [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 1,377,000      
Land 361,000      
Buildings, Fixtures and Improvements 2,637,000      
Costs Capitalized Subsequent to Acquisition 32,000      
Gross Amount Carried at December 31, 2019 3,030,000      
Accumulated Depreciation (654,000)      
Tractor Supply [Member] | Columbia, SC [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 952,000      
Buildings, Fixtures and Improvements 2,222,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 3,174,000      
Accumulated Depreciation (526,000)      
Tractor Supply [Member] | Paducah, KY [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 393,000      
Buildings, Fixtures and Improvements 1,574,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 1,967,000      
Accumulated Depreciation (515,000)      
Tractor Supply [Member] | Grayson, KY [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 540,000      
Buildings, Fixtures and Improvements 2,709,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 3,249,000      
Accumulated Depreciation (666,000)      
Tractor Supply [Member] | Rincon, GA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 978,000      
Buildings, Fixtures and Improvements 2,016,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 2,994,000      
Accumulated Depreciation (476,000)      
Petco [Member] | Lake Charles LA 3 [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 2,145,000      
Land 690,000      
Buildings, Fixtures and Improvements 4,072,000      
Costs Capitalized Subsequent to Acquisition 54,000      
Gross Amount Carried at December 31, 2019 4,816,000      
Accumulated Depreciation (1,104,000)      
Petco [Member] | Tucson, AZ 2 [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,176,000      
Buildings, Fixtures and Improvements 8,565,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 9,741,000      
Accumulated Depreciation (624,000)      
Petco [Member] | Dardenne Prairie, MO [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 806,000      
Buildings, Fixtures and Improvements 3,024,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 3,830,000      
Accumulated Depreciation (786,000)      
GetGo [Member] | Lancaster, OH [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 2,210,000      
Buildings, Fixtures and Improvements 15,649,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 17,859,000      
Accumulated Depreciation (3,948,000)      
7-Eleven [Member] | Carrizo Springs, TX [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 496,000      
Buildings, Fixtures and Improvements 2,526,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 3,022,000      
Accumulated Depreciation (843,000)      
7-Eleven [Member] | Laredo, TX 3 [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 581,000      
Buildings, Fixtures and Improvements 2,367,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 2,948,000      
Accumulated Depreciation (774,000)      
7-Eleven [Member] | Brownsville, TX [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 613,000      
Buildings, Fixtures and Improvements 3,195,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 3,808,000      
Accumulated Depreciation (984,000)      
Stripes [Member] | Midland, TX [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,098,000      
Buildings, Fixtures and Improvements 4,857,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 5,955,000      
Accumulated Depreciation (1,485,000)      
Stripes [Member] | Haskell, TX [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 143,000      
Buildings, Fixtures and Improvements 2,554,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 2,697,000      
Accumulated Depreciation (825,000)      
Stripes [Member] | Laredo TX 4 [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 626,000      
Buildings, Fixtures and Improvements 2,338,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 2,964,000      
Accumulated Depreciation (779,000)      
Stripes [Member] | Fort Stockton, TX [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,237,000      
Buildings, Fixtures and Improvements 3,812,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 5,049,000      
Accumulated Depreciation (1,392,000)      
Stripes [Member] | Portales, NM [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 306,000      
Buildings, Fixtures and Improvements 2,595,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 2,901,000      
Accumulated Depreciation (853,000)      
Stripes [Member] | Odessa, TX 6 [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 301,000      
Buildings, Fixtures and Improvements 2,895,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 3,196,000      
Accumulated Depreciation (918,000)      
Ulta Beauty [Member] | Jackson, TN [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 1,454,000      
Land 547,000      
Buildings, Fixtures and Improvements 2,123,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 2,670,000      
Accumulated Depreciation (566,000)      
Wal-Mart [Member] | Pueblo, CO [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 8,249,000      
Land 2,586,000      
Buildings, Fixtures and Improvements 12,512,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 15,098,000      
Accumulated Depreciation (3,843,000)      
CVS [Member] | Jackson, TN [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 3,082,000      
Land 1,209,000      
Buildings, Fixtures and Improvements 2,822,000      
Costs Capitalized Subsequent to Acquisition 15,000      
Gross Amount Carried at December 31, 2019 4,046,000      
Accumulated Depreciation (951,000)      
CVS [Member] | Auburndale, FL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,418,000      
Buildings, Fixtures and Improvements 2,038,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 3,456,000      
Accumulated Depreciation (616,000)      
CVS [Member] | Oklahoma City, OK [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 569,000      
Buildings, Fixtures and Improvements 1,609,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 2,178,000      
Accumulated Depreciation (458,000)      
CVS [Member] | Boca Raton, FL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 2,625,000      
Land 0      
Buildings, Fixtures and Improvements 3,560,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 3,560,000      
Accumulated Depreciation (1,167,000)      
CVS [Member] | City of Industry, CA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 2,500,000      
Land 1,224,000      
Buildings, Fixtures and Improvements 3,202,000      
Costs Capitalized Subsequent to Acquisition (30,000)      
Gross Amount Carried at December 31, 2019 4,396,000      
Accumulated Depreciation (1,238,000)      
CVS [Member] | Jacksonville, FL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 3,715,000      
Land 2,240,000      
Buildings, Fixtures and Improvements 4,323,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 6,563,000      
Accumulated Depreciation (1,310,000)      
CVS [Member] | Naples, FL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 2,675,000      
Land 0      
Buildings, Fixtures and Improvements 4,164,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 4,164,000      
Accumulated Depreciation (1,262,000)      
CVS [Member] | Southaven, MS 2 [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 4,270,000      
Land 1,281,000      
Buildings, Fixtures and Improvements 4,100,000      
Costs Capitalized Subsequent to Acquisition (72,000)      
Gross Amount Carried at December 31, 2019 5,309,000      
Accumulated Depreciation (1,409,000)      
CVS [Member] | The Village, OK [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 3,425,000      
Land 520,000      
Buildings, Fixtures and Improvements 4,730,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 5,250,000      
Accumulated Depreciation (1,414,000)      
CVS [Member] | Lawrence, KS [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 2,908,000      
Land 837,000      
Buildings, Fixtures and Improvements 4,392,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 5,229,000      
Accumulated Depreciation (1,322,000)      
CVS [Member] | Lawrenceville, NJ [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 5,170,000      
Land 2,674,000      
Buildings, Fixtures and Improvements 6,412,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 9,086,000      
Accumulated Depreciation (1,900,000)      
CVS [Member] | Mineola, NY [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 2,280,000      
Land 0      
Buildings, Fixtures and Improvements 5,120,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 5,120,000      
Accumulated Depreciation (1,494,000)      
CVS [Member] | Las Cruces, NM [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 4,925,000      
Land 1,295,000      
Buildings, Fixtures and Improvements 5,178,000      
Costs Capitalized Subsequent to Acquisition 17,000      
Gross Amount Carried at December 31, 2019 6,490,000      
Accumulated Depreciation (1,744,000)      
CVS [Member] | Gainesville, TX [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 2,215,000      
Land 341,000      
Buildings, Fixtures and Improvements 3,334,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 3,675,000      
Accumulated Depreciation (971,000)      
CVS [Member] | Dover, DE [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 2,046,000      
Land 4,081,000      
Buildings, Fixtures and Improvements 0      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 4,081,000      
Accumulated Depreciation 0      
CVS [Member] | San Antonio, TX [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 3,806,000      
Land 1,996,000      
Buildings, Fixtures and Improvements 2,993,000      
Costs Capitalized Subsequent to Acquisition 16,000      
Gross Amount Carried at December 31, 2019 5,005,000      
Accumulated Depreciation (1,009,000)      
CVS [Member] | Evansville, IN [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 227,000      
Buildings, Fixtures and Improvements 3,060,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 3,287,000      
Accumulated Depreciation (909,000)      
CVS [Member] | Edinburgh, IN [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 420,000      
Buildings, Fixtures and Improvements 1,530,000      
Costs Capitalized Subsequent to Acquisition 60,000      
Gross Amount Carried at December 31, 2019 2,010,000      
Accumulated Depreciation (513,000)      
CVS [Member] | Columbia, SC [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 2,278,000      
Land 0      
Buildings, Fixtures and Improvements 2,811,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 2,811,000      
Accumulated Depreciation (822,000)      
CVS [Member] | Edison, NJ [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 3,318,000      
Buildings, Fixtures and Improvements 0      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 3,318,000      
Accumulated Depreciation 0      
CVS [Member] | Alpharetta, GA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 572,000      
Buildings, Fixtures and Improvements 858,000      
Costs Capitalized Subsequent to Acquisition 141,000      
Gross Amount Carried at December 31, 2019 1,571,000      
Accumulated Depreciation (315,000)      
CVS [Member] | Fort Worth, TX [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 4,147,000      
Land 2,453,000      
Buildings, Fixtures and Improvements 3,679,000      
Costs Capitalized Subsequent to Acquisition 15,000      
Gross Amount Carried at December 31, 2019 6,147,000      
Accumulated Depreciation (1,239,000)      
CVS [Member] | Phoenix, AZ [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 5,025,000      
Land 1,511,000      
Buildings, Fixtures and Improvements 4,533,000      
Costs Capitalized Subsequent to Acquisition 4,000      
Gross Amount Carried at December 31, 2019 6,048,000      
Accumulated Depreciation (1,527,000)      
CVS [Member] | Duncanville, TX [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 670,000      
Buildings, Fixtures and Improvements 2,681,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 3,351,000      
Accumulated Depreciation (875,000)      
CVS [Member] | Nashville, TN [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 203,000      
Buildings, Fixtures and Improvements 1,148,000      
Costs Capitalized Subsequent to Acquisition 82,000      
Gross Amount Carried at December 31, 2019 1,433,000      
Accumulated Depreciation (425,000)      
Arby's [Member] | Daytona Beach, FL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 16,557,000      
Land 4,598,000      
Buildings, Fixtures and Improvements 28,511,000      
Costs Capitalized Subsequent to Acquisition (18,163,000)      
Gross Amount Carried at December 31, 2019 14,946,000      
Accumulated Depreciation (730,000)      
Arby's [Member] | Louisville, KY [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 336,000      
Buildings, Fixtures and Improvements 625,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 961,000      
Accumulated Depreciation (251,000)      
Arby's [Member] | Indianapolis, IN [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 530,000      
Buildings, Fixtures and Improvements 1,236,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 1,766,000      
Accumulated Depreciation (406,000)      
Arby's [Member] | Saginaw, MI [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 310,000      
Buildings, Fixtures and Improvements 1,110,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 1,420,000      
Accumulated Depreciation (365,000)      
Arby's [Member] | Grand Rapids, MI [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 230,000      
Buildings, Fixtures and Improvements 1,289,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 1,519,000      
Accumulated Depreciation (94,000)      
Arby's [Member] | Atlanta, GA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,207,000      
Buildings, Fixtures and Improvements 987,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 2,194,000      
Accumulated Depreciation (313,000)      
Arby's [Member] | Flint, MI [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 110,000      
Buildings, Fixtures and Improvements 1,422,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 1,532,000      
Accumulated Depreciation (467,000)      
Arby's [Member] | Douglasville, GA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 370,000      
Buildings, Fixtures and Improvements 1,692,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 2,062,000      
Accumulated Depreciation (556,000)      
Arby's [Member] | Phoenix, AZ [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 559,000      
Buildings, Fixtures and Improvements 618,000      
Costs Capitalized Subsequent to Acquisition 200,000      
Gross Amount Carried at December 31, 2019 1,377,000      
Accumulated Depreciation (219,000)      
AAA [Member] | Oklahoma City, OK [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 3,639,000      
Buildings, Fixtures and Improvements 32,567,000      
Costs Capitalized Subsequent to Acquisition 178,000      
Gross Amount Carried at December 31, 2019 36,384,000      
Accumulated Depreciation (9,182,000)      
NTT Data [Member] | Lincoln, NE [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 2,812,000      
Buildings, Fixtures and Improvements 25,566,000      
Costs Capitalized Subsequent to Acquisition (355,000)      
Gross Amount Carried at December 31, 2019 28,023,000      
Accumulated Depreciation (7,308,000)      
Hanesbrands [Member] | Rural Hall, NC [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,798,000      
Buildings, Fixtures and Improvements 41,214,000      
Costs Capitalized Subsequent to Acquisition (50,000)      
Gross Amount Carried at December 31, 2019 42,962,000      
Accumulated Depreciation (10,677,000)      
Best Buy [Member] | Pineville, NC [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,818,000      
Buildings, Fixtures and Improvements 7,970,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 9,788,000      
Accumulated Depreciation (2,343,000)      
Best Buy [Member] | Indianapolis, IN [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 665,000      
Buildings, Fixtures and Improvements 4,775,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 5,440,000      
Accumulated Depreciation (1,410,000)      
Best Buy [Member] | Marquette, MI [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 836,000      
Buildings, Fixtures and Improvements 4,207,000      
Costs Capitalized Subsequent to Acquisition 1,111,000      
Gross Amount Carried at December 31, 2019 6,154,000      
Accumulated Depreciation (1,554,000)      
Best Buy [Member] | Norton Shores, MI [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,568,000      
Buildings, Fixtures and Improvements 4,099,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 5,667,000      
Accumulated Depreciation (1,206,000)      
Best Buy [Member] | Kenosha, WI [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,925,000      
Buildings, Fixtures and Improvements 5,503,000      
Costs Capitalized Subsequent to Acquisition 127,000      
Gross Amount Carried at December 31, 2019 7,555,000      
Accumulated Depreciation (1,614,000)      
Best Buy [Member] | Richmond, IN [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 549,000      
Buildings, Fixtures and Improvements 4,429,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 4,978,000      
Accumulated Depreciation (1,334,000)      
Best Buy [Member] | Southaven, MS [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 2,045,000      
Buildings, Fixtures and Improvements 4,318,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 6,363,000      
Accumulated Depreciation (1,326,000)      
Walgreens [Member] | Denver, CO [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 3,350,000      
Land 0      
Buildings, Fixtures and Improvements 4,050,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 4,050,000      
Accumulated Depreciation (1,392,000)      
Walgreens [Member] | Matteson, IL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 2,450,000      
Land 416,000      
Buildings, Fixtures and Improvements 4,070,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 4,486,000      
Accumulated Depreciation (1,150,000)      
Walgreens [Member] | Grayson, GA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 2,720,000      
Land 947,000      
Buildings, Fixtures and Improvements 3,747,000      
Costs Capitalized Subsequent to Acquisition 1,000      
Gross Amount Carried at December 31, 2019 4,695,000      
Accumulated Depreciation (1,107,000)      
Walgreens [Member] | Tucson, AZ 2 [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 2,910,000      
Land 1,406,000      
Buildings, Fixtures and Improvements 3,571,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 4,977,000      
Accumulated Depreciation (1,078,000)      
Walgreens [Member] | Jeffersonville, IN [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 824,000      
Buildings, Fixtures and Improvements 2,472,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 3,296,000      
Accumulated Depreciation (899,000)      
Walgreens [Member] | South Elgin, IL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 2,124,000      
Land 1,710,000      
Buildings, Fixtures and Improvements 3,208,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 4,918,000      
Accumulated Depreciation (980,000)      
Walgreens [Member] | Medina, OH [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 820,000      
Buildings, Fixtures and Improvements 4,585,000      
Costs Capitalized Subsequent to Acquisition 81,000      
Gross Amount Carried at December 31, 2019 5,486,000      
Accumulated Depreciation (1,333,000)      
Walgreens [Member] | Chicago, IL 3 [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 952,000      
Buildings, Fixtures and Improvements 3,235,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 4,187,000      
Accumulated Depreciation (950,000)      
Walgreens [Member] | Decatur, GA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,746,000      
Buildings, Fixtures and Improvements 3,337,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 5,083,000      
Accumulated Depreciation (1,005,000)      
Walgreens [Member] | Chicago, IL 4 [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 911,000      
Buildings, Fixtures and Improvements 4,830,000      
Costs Capitalized Subsequent to Acquisition 46,000      
Gross Amount Carried at December 31, 2019 5,787,000      
Accumulated Depreciation (1,388,000)      
Walgreens [Member] | Clarkston, MI [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 2,768,000      
Buildings, Fixtures and Improvements 3,197,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 5,965,000      
Accumulated Depreciation (964,000)      
Walgreens [Member] | Watertown, NY [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 2,937,000      
Buildings, Fixtures and Improvements 2,664,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 5,601,000      
Accumulated Depreciation (815,000)      
Walgreens [Member] | Bartlett, TN [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 2,358,000      
Buildings, Fixtures and Improvements 2,194,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 4,552,000      
Accumulated Depreciation (649,000)      
Walgreens [Member] | Tucson, AZ [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,234,000      
Buildings, Fixtures and Improvements 5,143,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 6,377,000      
Accumulated Depreciation (1,521,000)      
Walgreens [Member] | Chicago, IL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,212,000      
Buildings, Fixtures and Improvements 2,829,000      
Costs Capitalized Subsequent to Acquisition 198,000      
Gross Amount Carried at December 31, 2019 4,239,000      
Accumulated Depreciation (1,015,000)      
Childtime Childcare [Member] | Oklahoma City, OK [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 124,000      
Buildings, Fixtures and Improvements 796,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 920,000      
Accumulated Depreciation (243,000)      
Childtime Childcare [Member] | Modesto, CA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 280,000      
Buildings, Fixtures and Improvements 1,524,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 1,804,000      
Accumulated Depreciation (430,000)      
Childtime Childcare [Member] | Oklahoma City, OK 2 [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 108,000      
Buildings, Fixtures and Improvements 793,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 901,000      
Accumulated Depreciation (235,000)      
Childtime Childcare [Member] | Bedford, OH [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 111,000      
Buildings, Fixtures and Improvements 852,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 963,000      
Accumulated Depreciation (263,000)      
Sherwin-Williams [Member] | Muskegon, MI [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 187,000      
Buildings, Fixtures and Improvements 1,524,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 1,711,000      
Accumulated Depreciation (437,000)      
Tutor Time [Member] | Downingtown, PA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 205,000      
Buildings, Fixtures and Improvements 2,788,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 2,993,000      
Accumulated Depreciation (784,000)      
Tutor Time [Member] | Austin, TX [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 417,000      
Buildings, Fixtures and Improvements 1,861,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 2,278,000      
Accumulated Depreciation (547,000)      
Children's Courtyard [Member] | Grand Prairie, TX [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 367,000      
Buildings, Fixtures and Improvements 1,055,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 1,422,000      
Accumulated Depreciation (309,000)      
Healthnow [Member] | Buffalo, NY [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 40,299,000      
Land 2,569,000      
Buildings, Fixtures and Improvements 89,399,000      
Costs Capitalized Subsequent to Acquisition 194,000      
Gross Amount Carried at December 31, 2019 92,162,000      
Accumulated Depreciation (19,698,000)      
Advance Auto Parts [Member] | Oklahoma City, OK [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 208,000      
Buildings, Fixtures and Improvements 1,178,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 1,386,000      
Accumulated Depreciation (410,000)      
Advance Auto Parts [Member] | Milwaukee, WI [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 610,000      
Buildings, Fixtures and Improvements 1,473,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 2,083,000      
Accumulated Depreciation (405,000)      
Advance Auto Parts [Member] | Lehigh Acres, FL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 1,425,000      
Land 379,000      
Buildings, Fixtures and Improvements 2,016,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 2,395,000      
Accumulated Depreciation (568,000)      
Advance Auto Parts [Member] | Howell, MI [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 830,000      
Land 439,000      
Buildings, Fixtures and Improvements 1,471,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 1,910,000      
Accumulated Depreciation (397,000)      
Advance Auto Parts [Member] | Salem, OH [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 660,000      
Land 267,000      
Buildings, Fixtures and Improvements 1,147,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 1,414,000      
Accumulated Depreciation (318,000)      
Advance Auto Parts [Member] | Houston, TX 3 [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 837,000      
Buildings, Fixtures and Improvements 685,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 1,522,000      
Accumulated Depreciation (238,000)      
Advance Auto Parts [Member] | Louisville, KY [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 740,000      
Land 336,000      
Buildings, Fixtures and Improvements 1,289,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 1,625,000      
Accumulated Depreciation (347,000)      
Advance Auto Parts [Member] | Bedford, IN [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 760,000      
Land 100,000      
Buildings, Fixtures and Improvements 1,386,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 1,486,000      
Accumulated Depreciation (386,000)      
Advance Auto Parts [Member] | Bethel, OH [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 730,000      
Land 234,000      
Buildings, Fixtures and Improvements 1,305,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 1,539,000      
Accumulated Depreciation (361,000)      
Advance Auto Parts [Member] | Crestwood, KY [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 1,030,000      
Land 400,000      
Buildings, Fixtures and Improvements 1,546,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 1,946,000      
Accumulated Depreciation (416,000)      
Advance Auto Parts [Member] | Grand Rapids, MI [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 368,000      
Buildings, Fixtures and Improvements 1,296,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 1,664,000      
Accumulated Depreciation (342,000)      
Advance Auto Parts [Member] | Charlotte, NC [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 723,000      
Buildings, Fixtures and Improvements 883,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 1,606,000      
Accumulated Depreciation (253,000)      
Advance Auto Parts [Member] | Rock Hill, SC [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 506,000      
Buildings, Fixtures and Improvements 915,000      
Costs Capitalized Subsequent to Acquisition 45,000      
Gross Amount Carried at December 31, 2019 1,466,000      
Accumulated Depreciation (257,000)      
Advance Auto Parts [Member] | Kenosha, WI [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 569,000      
Buildings, Fixtures and Improvements 465,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 1,034,000      
Accumulated Depreciation (154,000)      
Advance Auto Parts [Member] | Greenwood, SC [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 210,000      
Buildings, Fixtures and Improvements 630,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 840,000      
Accumulated Depreciation (227,000)      
Advance Auto Parts [Member] | Manistee, MI [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 348,000      
Buildings, Fixtures and Improvements 1,043,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 1,391,000      
Accumulated Depreciation (343,000)      
Advance Auto Parts [Member] | Vermilion, OH [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 337,000      
Buildings, Fixtures and Improvements 1,079,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 1,416,000      
Accumulated Depreciation (320,000)      
Advance Auto Parts [Member] | Massillon, OH [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 218,000      
Buildings, Fixtures and Improvements 1,987,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 2,205,000      
Accumulated Depreciation (549,000)      
Advance Auto Parts [Member] | Monroe, MI [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 549,000      
Buildings, Fixtures and Improvements 1,434,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 1,983,000      
Accumulated Depreciation (393,000)      
Advance Auto Parts [Member] | South Lyon, MI [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 402,000      
Buildings, Fixtures and Improvements 1,607,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 2,009,000      
Accumulated Depreciation (435,000)      
Advance Auto Parts [Member] | Flint, MI [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 133,000      
Buildings, Fixtures and Improvements 534,000      
Costs Capitalized Subsequent to Acquisition 92,000      
Gross Amount Carried at December 31, 2019 759,000      
Accumulated Depreciation (198,000)      
Advance Auto Parts [Member] | Richmond, IN [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 377,000      
Buildings, Fixtures and Improvements 1,616,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 1,993,000      
Accumulated Depreciation (442,000)      
Advance Auto Parts [Member] | Houston, TX 2 [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 800,000      
Land 248,000      
Buildings, Fixtures and Improvements 991,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 1,239,000      
Accumulated Depreciation (370,000)      
Advance Auto Parts [Member] | Brownstown, MI [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 482,000      
Buildings, Fixtures and Improvements 1,760,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 2,242,000      
Accumulated Depreciation (479,000)      
Advance Auto Parts [Member] | Romulus, MI [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 422,000      
Buildings, Fixtures and Improvements 1,568,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 1,990,000      
Accumulated Depreciation (438,000)      
Advance Auto Parts [Member] | Washington Twnshp, MI [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 645,000      
Buildings, Fixtures and Improvements 1,711,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 2,356,000      
Accumulated Depreciation (468,000)      
All Cleaners [Member] | Bartlett, IL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 7,060,000      
Land 4,437,000      
Buildings, Fixtures and Improvements 5,970,000      
Costs Capitalized Subsequent to Acquisition 2,555,000      
Gross Amount Carried at December 31, 2019 12,962,000      
Accumulated Depreciation (2,236,000)      
Bed Bath & Beyond [Member] | Folsom, CA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 21,600,000      
Land 10,314,000      
Buildings, Fixtures and Improvements 27,983,000      
Costs Capitalized Subsequent to Acquisition 372,000      
Gross Amount Carried at December 31, 2019 38,669,000      
Accumulated Depreciation (7,716,000)      
Bed Bath & Beyond [Member] | San Marcos, TX [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 12,480,000      
Land 5,287,000      
Buildings, Fixtures and Improvements 20,357,000      
Costs Capitalized Subsequent to Acquisition 171,000      
Gross Amount Carried at December 31, 2019 25,815,000      
Accumulated Depreciation (5,533,000)      
Staples [Member] | Pensacola, FL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,539,000      
Buildings, Fixtures and Improvements 3,354,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 4,893,000      
Accumulated Depreciation (849,000)      
O'Reilly Auto Parts [Member] | Christiansburg, VA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 646,000      
Land 562,000      
Buildings, Fixtures and Improvements 793,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 1,355,000      
Accumulated Depreciation (219,000)      
O'Reilly Auto Parts [Member] | San Antonio, TX [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 703,000      
Land 439,000      
Buildings, Fixtures and Improvements 1,030,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 1,469,000      
Accumulated Depreciation (280,000)      
O'Reilly Auto Parts [Member] | Ravenna, OH [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 144,000      
Buildings, Fixtures and Improvements 1,137,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 1,281,000      
Accumulated Depreciation (321,000)      
O'Reilly Auto Parts [Member] | Houston, TX 3 [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 560,000      
Land 340,000      
Buildings, Fixtures and Improvements 895,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 1,235,000      
Accumulated Depreciation (237,000)      
O'Reilly Auto Parts [Member] | Highlands, TX [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 485,000      
Land 281,000      
Buildings, Fixtures and Improvements 813,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 1,094,000      
Accumulated Depreciation (215,000)      
O'Reilly Auto Parts [Member] | Louisville, KY [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 573,000      
Buildings, Fixtures and Improvements 794,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 1,367,000      
Accumulated Depreciation (234,000)      
Thorntons Oil [Member] | Clarksville, IN [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,319,000      
Buildings, Fixtures and Improvements 687,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 2,006,000      
Accumulated Depreciation (264,000)      
Thorntons Oil [Member] | Jeffersonville, IN [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,233,000      
Buildings, Fixtures and Improvements 1,533,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 2,766,000      
Accumulated Depreciation (527,000)      
Thorntons Oil [Member] | Franklin Park, IL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,403,000      
Buildings, Fixtures and Improvements 1,882,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 3,285,000      
Accumulated Depreciation (597,000)      
Thorntons Oil [Member] | Westmont, IL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 760,000      
Buildings, Fixtures and Improvements 3,069,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 3,829,000      
Accumulated Depreciation (930,000)      
Thorntons Oil [Member] | Springfield, IL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 926,000      
Buildings, Fixtures and Improvements 2,514,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 3,440,000      
Accumulated Depreciation (898,000)      
Thorntons Oil [Member] | Ottawa, IL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 565,000      
Buildings, Fixtures and Improvements 2,003,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 2,568,000      
Accumulated Depreciation (656,000)      
Thorntons Oil [Member] | Bloomington, IL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,184,000      
Buildings, Fixtures and Improvements 733,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 1,917,000      
Accumulated Depreciation (261,000)      
Thorntons Oil [Member] | Joliet, IL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 953,000      
Buildings, Fixtures and Improvements 2,539,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 3,492,000      
Accumulated Depreciation (803,000)      
Thorntons Oil [Member] | Summit, IL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 2,233,000      
Buildings, Fixtures and Improvements 109,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 2,342,000      
Accumulated Depreciation (45,000)      
Thorntons Oil [Member] | Waukegan, IL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 875,000      
Buildings, Fixtures and Improvements 1,421,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 2,296,000      
Accumulated Depreciation (458,000)      
Thorntons Oil [Member] | Plainfield, IL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 862,000      
Buildings, Fixtures and Improvements 1,338,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 2,200,000      
Accumulated Depreciation (450,000)      
Thorntons Oil [Member] | South Elgin, IL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,239,000      
Buildings, Fixtures and Improvements 1,688,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 2,927,000      
Accumulated Depreciation (585,000)      
Thorntons Oil [Member] | Galloway, OH [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 547,000      
Buildings, Fixtures and Improvements 1,550,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 2,097,000      
Accumulated Depreciation (489,000)      
Thorntons Oil [Member] | Terre Haute, IN [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 732,000      
Buildings, Fixtures and Improvements 1,829,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 2,561,000      
Accumulated Depreciation (602,000)      
Thorntons Oil [Member] | Henderson, KY [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 659,000      
Buildings, Fixtures and Improvements 3,271,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 3,930,000      
Accumulated Depreciation (1,039,000)      
Thorntons Oil [Member] | Evansville, IN [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 467,000      
Buildings, Fixtures and Improvements 1,479,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 1,946,000      
Accumulated Depreciation (481,000)      
Thorntons Oil [Member] | Evansville, IN 2 [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 602,000      
Buildings, Fixtures and Improvements 1,398,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 2,000,000      
Accumulated Depreciation (454,000)      
Thorntons Oil [Member] | Henderson, KY 2 [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 483,000      
Buildings, Fixtures and Improvements 1,778,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 2,261,000      
Accumulated Depreciation (523,000)      
Thorntons Oil [Member] | Shelbyville, KY [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 299,000      
Buildings, Fixtures and Improvements 2,036,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 2,335,000      
Accumulated Depreciation (625,000)      
Thorntons Oil [Member] | Louisville, KY [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 637,000      
Buildings, Fixtures and Improvements 1,680,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 2,317,000      
Accumulated Depreciation (486,000)      
Thorntons Oil [Member] | Edinburgh, IN [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 685,000      
Buildings, Fixtures and Improvements 1,505,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 2,190,000      
Accumulated Depreciation (485,000)      
Thorntons Oil [Member] | Oaklawn, IL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,203,000      
Buildings, Fixtures and Improvements 898,000      
Costs Capitalized Subsequent to Acquisition 278,000      
Gross Amount Carried at December 31, 2019 2,379,000      
Accumulated Depreciation (307,000)      
L.A. Fitness [Member] | Indianapolis, IN [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,279,000      
Buildings, Fixtures and Improvements 8,970,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 10,249,000      
Accumulated Depreciation (2,619,000)      
L.A. Fitness [Member] | Marana, AZ [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,284,000      
Buildings, Fixtures and Improvements 8,322,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 9,606,000      
Accumulated Depreciation (2,523,000)      
L.A. Fitness [Member] | Broadview, IL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 3,345,000      
Buildings, Fixtures and Improvements 8,763,000      
Costs Capitalized Subsequent to Acquisition 276,000      
Gross Amount Carried at December 31, 2019 12,384,000      
Accumulated Depreciation (2,611,000)      
L.A. Fitness [Member] | Dallas, TX [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 4,712,000      
Land 2,629,000      
Buildings, Fixtures and Improvements 10,413,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 13,042,000      
Accumulated Depreciation (2,902,000)      
L.A. Fitness [Member] | Duncanville, TX [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,538,000      
Buildings, Fixtures and Improvements 10,023,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 11,561,000      
Accumulated Depreciation (2,844,000)      
L.A. Fitness [Member] | Avondale, AZ [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 2,253,000      
Buildings, Fixtures and Improvements 9,040,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 11,293,000      
Accumulated Depreciation (2,645,000)      
Family Fare [Member] | Battle Creek, MI [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,393,000      
Buildings, Fixtures and Improvements 7,950,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 9,343,000      
Accumulated Depreciation (2,379,000)      
Lowe's [Member] | Columbia, SC [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 5,485,000      
Buildings, Fixtures and Improvements 0      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 5,485,000      
Accumulated Depreciation 0      
Lowe's [Member] | West Carrollton, OH [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 2,864,000      
Buildings, Fixtures and Improvements 9,883,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 12,747,000      
Accumulated Depreciation (2,433,000)      
Dick's Sporting Goods [Member] | Jackson, TN [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,346,000      
Buildings, Fixtures and Improvements 6,106,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 7,452,000      
Accumulated Depreciation (1,793,000)      
Dick's Sporting Goods [Member] | Charleston, SC [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 3,733,000      
Buildings, Fixtures and Improvements 5,025,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 8,758,000      
Accumulated Depreciation (1,579,000)      
Kohl's [Member] | Howell, MI [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 7,705,000      
Land 547,000      
Buildings, Fixtures and Improvements 10,399,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 10,946,000      
Accumulated Depreciation (4,105,000)      
Kohl's [Member] | Columbia, SC [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,532,000      
Buildings, Fixtures and Improvements 14,561,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 16,093,000      
Accumulated Depreciation (3,432,000)      
Kohl's [Member] | Saginaw, MI [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,110,000      
Buildings, Fixtures and Improvements 6,932,000      
Costs Capitalized Subsequent to Acquisition 104,000      
Gross Amount Carried at December 31, 2019 8,146,000      
Accumulated Depreciation (1,710,000)      
Kohl's [Member] | Brownsville, TX [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 2,756,000      
Buildings, Fixtures and Improvements 3,423,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 6,179,000      
Accumulated Depreciation (46,000)      
St. Luke's Urgent Care [Member] | Creve Coeur, MO [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,644,000      
Buildings, Fixtures and Improvements 4,497,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 6,141,000      
Accumulated Depreciation (1,436,000)      
DaVita Dialvsis [Member] | Grand Rapids, MI [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 215,000      
Buildings, Fixtures and Improvements 1,794,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 2,009,000      
Accumulated Depreciation (450,000)      
DaVita Dialvsis [Member] | Augusta, GA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 118,000      
Buildings, Fixtures and Improvements 1,818,000      
Costs Capitalized Subsequent to Acquisition 47,000      
Gross Amount Carried at December 31, 2019 1,983,000      
Accumulated Depreciation (394,000)      
DaVita Dialvsis [Member] | Douglasville, GA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 119,000      
Buildings, Fixtures and Improvements 1,858,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 1,977,000      
Accumulated Depreciation (403,000)      
Hobby Lobby [Member] | Avon, IN [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,439,000      
Buildings, Fixtures and Improvements 5,855,000      
Costs Capitalized Subsequent to Acquisition 115,000      
Gross Amount Carried at December 31, 2019 7,409,000      
Accumulated Depreciation (1,614,000)      
Hobby Lobby [Member] | Logan, UT [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 2,683,000      
Buildings, Fixtures and Improvements 3,079,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 5,762,000      
Accumulated Depreciation (960,000)      
Bi-Lo's LLC [Member] | Greenwood, SC [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 533,000      
Buildings, Fixtures and Improvements 4,212,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 4,745,000      
Accumulated Depreciation (1,245,000)      
FedEx [Member] | Evansville, IN [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 665,000      
Buildings, Fixtures and Improvements 2,661,000      
Costs Capitalized Subsequent to Acquisition 7,000      
Gross Amount Carried at December 31, 2019 3,333,000      
Accumulated Depreciation (1,070,000)      
FedEx [Member] | Mccomb, MS [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 548,000      
Buildings, Fixtures and Improvements 3,268,000      
Costs Capitalized Subsequent to Acquisition 2,212,000      
Gross Amount Carried at December 31, 2019 6,028,000      
Accumulated Depreciation (1,135,000)      
FedEx [Member] | Bossier City, LA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 295,000      
Buildings, Fixtures and Improvements 6,223,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 6,518,000      
Accumulated Depreciation (1,685,000)      
FedEx [Member] | Des Moines, IA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 733,000      
Buildings, Fixtures and Improvements 1,361,000      
Costs Capitalized Subsequent to Acquisition 183,000      
Gross Amount Carried at December 31, 2019 2,277,000      
Accumulated Depreciation (523,000)      
Vacant [Member] | Prattville, AL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,038,000      
Buildings, Fixtures and Improvements 1,802,000      
Costs Capitalized Subsequent to Acquisition (1,871,000)      
Gross Amount Carried at December 31, 2019 969,000      
Accumulated Depreciation (145,000)      
Vacant [Member] | Columbus GA 5 [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,307,000      
Buildings, Fixtures and Improvements 2,529,000      
Costs Capitalized Subsequent to Acquisition (2,876,000)      
Gross Amount Carried at December 31, 2019 960,000      
Accumulated Depreciation (152,000)      
Vacant [Member] | Bossier City, LA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,168,000      
Buildings, Fixtures and Improvements 2,594,000      
Costs Capitalized Subsequent to Acquisition (2,883,000)      
Gross Amount Carried at December 31, 2019 879,000      
Accumulated Depreciation (136,000)      
Vacant [Member] | Sevierville, TN [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,443,000      
Buildings, Fixtures and Improvements 430,000      
Costs Capitalized Subsequent to Acquisition (750,000)      
Gross Amount Carried at December 31, 2019 1,123,000      
Accumulated Depreciation (109,000)      
Vacant [Member] | Massillon, OH [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 212,000      
Buildings, Fixtures and Improvements 1,202,000      
Costs Capitalized Subsequent to Acquisition (1,269,000)      
Gross Amount Carried at December 31, 2019 145,000      
Accumulated Depreciation (1,000)      
Vacant [Member] | Dallas, TX [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 810,000      
Buildings, Fixtures and Improvements 1,656,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 2,466,000      
Accumulated Depreciation (550,000)      
Vacant [Member] | Augusta, GA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 178,000      
Buildings, Fixtures and Improvements 533,000      
Costs Capitalized Subsequent to Acquisition (591,000)      
Gross Amount Carried at December 31, 2019 120,000      
Accumulated Depreciation (9,000)      
Golden Corral [Member] | Lincoln, NE [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 300,000      
Buildings, Fixtures and Improvements 2,930,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 3,230,000      
Accumulated Depreciation (974,000)      
Golden Corral [Member] | Clarksville, IN [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,061,000      
Buildings, Fixtures and Improvements 1,344,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 2,405,000      
Accumulated Depreciation (542,000)      
Golden Corral [Member] | Henderson, KY [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 600,000      
Buildings, Fixtures and Improvements 1,586,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 2,186,000      
Accumulated Depreciation (527,000)      
Golden Corral [Member] | Evansville, IN [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 670,000      
Buildings, Fixtures and Improvements 2,707,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 3,377,000      
Accumulated Depreciation (900,000)      
Golden Corral [Member] | Louisville, KY [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,020,000      
Buildings, Fixtures and Improvements 1,173,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 2,193,000      
Accumulated Depreciation (384,000)      
Golden Corral [Member] | Rock Hill, SC [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 320,000      
Buildings, Fixtures and Improvements 2,130,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 2,450,000      
Accumulated Depreciation (708,000)      
Golden Corral [Member] | Cullman, AL 3 [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 847,000      
Buildings, Fixtures and Improvements 2,390,000      
Costs Capitalized Subsequent to Acquisition (2,143,000)      
Gross Amount Carried at December 31, 2019 1,094,000      
Accumulated Depreciation (177,000)      
Golden Corral [Member] | Owensboro, KY [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,244,000      
Buildings, Fixtures and Improvements 1,656,000      
Costs Capitalized Subsequent to Acquisition (1,942,000)      
Gross Amount Carried at December 31, 2019 958,000      
Accumulated Depreciation (130,000)      
Golden Corral [Member] | Horn Lake, MS [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 925,000      
Buildings, Fixtures and Improvements 2,463,000      
Costs Capitalized Subsequent to Acquisition (2,320,000)      
Gross Amount Carried at December 31, 2019 1,068,000      
Accumulated Depreciation (173,000)      
Golden Corral [Member] | Coon Rapids, MN [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,611,000      
Buildings, Fixtures and Improvements 2,188,000      
Costs Capitalized Subsequent to Acquisition (2,894,000)      
Gross Amount Carried at December 31, 2019 905,000      
Accumulated Depreciation (111,000)      
Golden Corral [Member] | Beckley, WV [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,248,000      
Buildings, Fixtures and Improvements 2,258,000      
Costs Capitalized Subsequent to Acquisition (2,508,000)      
Gross Amount Carried at December 31, 2019 998,000      
Accumulated Depreciation (151,000)      
Golden Corral [Member] | Richmond, IN [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 728,000      
Buildings, Fixtures and Improvements 723,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 1,451,000      
Accumulated Depreciation (258,000)      
Ryan's Buffet [Member] | Commerce, GA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 962,000      
Buildings, Fixtures and Improvements 1,470,000      
Costs Capitalized Subsequent to Acquisition (647,000)      
Gross Amount Carried at December 31, 2019 1,785,000      
Accumulated Depreciation (323,000)      
Ryan's Buffet [Member] | Rome, GA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 831,000      
Buildings, Fixtures and Improvements 1,848,000      
Costs Capitalized Subsequent to Acquisition (918,000)      
Gross Amount Carried at December 31, 2019 1,761,000      
Accumulated Depreciation (329,000)      
Ryan's Buffet [Member] | Asheville, NC [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,261,000      
Buildings, Fixtures and Improvements 2,204,000      
Costs Capitalized Subsequent to Acquisition (1,180,000)      
Gross Amount Carried at December 31, 2019 2,285,000      
Accumulated Depreciation (407,000)      
Longhorn Steakhouse [Member] | Paducah, KY [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,121,000      
Buildings, Fixtures and Improvements 1,443,000      
Costs Capitalized Subsequent to Acquisition (2,022,000)      
Gross Amount Carried at December 31, 2019 542,000      
Accumulated Depreciation (13,000)      
Glen's Market [Member] | Manistee, MI [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 294,000      
Buildings, Fixtures and Improvements 6,694,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 6,988,000      
Accumulated Depreciation (1,890,000)      
Banner Life Insurance [Member] | Urbana, MD [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 19,483,000      
Land 2,733,000      
Buildings, Fixtures and Improvements 31,483,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 34,216,000      
Accumulated Depreciation (8,103,000)      
ConAgra Brands [Member] | Milton, PA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 5,656,000      
Buildings, Fixtures and Improvements 27,242,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 32,898,000      
Accumulated Depreciation (6,973,000)      
Dahl's [Member] | Johnston, IA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 3,202,000      
Buildings, Fixtures and Improvements 6,644,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 9,846,000      
Accumulated Depreciation (2,021,000)      
Dahl's [Member] | Des Moines, IA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 2,871,000      
Buildings, Fixtures and Improvements 11,761,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 14,632,000      
Accumulated Depreciation (3,459,000)      
Dahl's [Member] | Des Moines, IA 2 [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 628,000      
Buildings, Fixtures and Improvements 3,947,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 4,575,000      
Accumulated Depreciation (1,187,000)      
Dahl's [Member] | Des Moines, IA 3 [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,163,000      
Buildings, Fixtures and Improvements 1,649,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 2,812,000      
Accumulated Depreciation (508,000)      
Owens Corning [Member] | Newark, OH [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 725,000      
Buildings, Fixtures and Improvements 13,013,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 13,738,000      
Accumulated Depreciation (3,227,000)      
California Pizza Kitchen [Member] | Alpharetta, GA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,279,000      
Buildings, Fixtures and Improvements 3,249,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 4,528,000      
Accumulated Depreciation (1,031,000)      
California Pizza Kitchen [Member] | Atlanta, GA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 2,307,000      
Buildings, Fixtures and Improvements 1,857,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 4,164,000      
Accumulated Depreciation (639,000)      
California Pizza Kitchen [Member] | Grapevine, TX [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,544,000      
Buildings, Fixtures and Improvements 2,250,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 3,794,000      
Accumulated Depreciation (731,000)      
California Pizza Kitchen [Member] | Paradise Valley, AZ [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 2,285,000      
Buildings, Fixtures and Improvements 1,480,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 3,765,000      
Accumulated Depreciation (520,000)      
California Pizza Kitchen [Member] | Schaumburg, IL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,180,000      
Buildings, Fixtures and Improvements 3,179,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 4,359,000      
Accumulated Depreciation (1,016,000)      
PetSmart [Member] | Sedalia, MO [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 273,000      
Buildings, Fixtures and Improvements 3,645,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 3,918,000      
Accumulated Depreciation (230,000)      
PetSmart [Member] | Boca Raton, FL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 3,514,000      
Buildings, Fixtures and Improvements 4,912,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 8,426,000      
Accumulated Depreciation (1,334,000)      
PetSmart [Member] | Westlake Village, CA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 3,406,000      
Buildings, Fixtures and Improvements 5,017,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 8,423,000      
Accumulated Depreciation (1,277,000)      
PetSmart [Member] | Lake Mary, FL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 2,430,000      
Buildings, Fixtures and Improvements 2,556,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 4,986,000      
Accumulated Depreciation (714,000)      
PetSmart [Member] | Plantation, FL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 965,000      
Buildings, Fixtures and Improvements 5,302,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 6,267,000      
Accumulated Depreciation (1,368,000)      
PetSmart [Member] | Tallahassee, FL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,468,000      
Buildings, Fixtures and Improvements 1,387,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 2,855,000      
Accumulated Depreciation (404,000)      
PetSmart [Member] | Evanston, IL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,120,000      
Buildings, Fixtures and Improvements 6,007,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 7,127,000      
Accumulated Depreciation (1,524,000)      
PetSmart [Member] | Braintree, MA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 2,805,000      
Buildings, Fixtures and Improvements 8,398,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 11,203,000      
Accumulated Depreciation (2,071,000)      
PetSmart [Member] | Oxon Hill, MD [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,722,000      
Buildings, Fixtures and Improvements 4,389,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 6,111,000      
Accumulated Depreciation (1,153,000)      
PetSmart [Member] | Flint, MI [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 606,000      
Buildings, Fixtures and Improvements 3,839,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 4,445,000      
Accumulated Depreciation (997,000)      
PetSmart [Member] | Dallas, TX [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 470,000      
Buildings, Fixtures and Improvements 6,089,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 6,559,000      
Accumulated Depreciation (1,483,000)      
PetSmart [Member] | Southlake, TX [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,063,000      
Buildings, Fixtures and Improvements 7,093,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 8,156,000      
Accumulated Depreciation (1,761,000)      
PetSmart [Member] | Parma, OH [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,288,000      
Buildings, Fixtures and Improvements 3,527,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 4,815,000      
Accumulated Depreciation (917,000)      
PetSmart [Member] | Phoenix, AZ [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 51,250,000      
Land 7,308,000      
Buildings, Fixtures and Improvements 97,510,000      
Costs Capitalized Subsequent to Acquisition 678,000      
Gross Amount Carried at December 31, 2019 105,496,000      
Accumulated Depreciation (22,281,000)      
Food Lion [Member] | Moyock, NC [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 1,269,000      
Buildings, Fixtures and Improvements 2,950,000      
Costs Capitalized Subsequent to Acquisition 266,000      
Gross Amount Carried at December 31, 2019 4,485,000      
Accumulated Depreciation (964,000)      
Stop & Shop [Member] | Cranston, RI [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 4,309,000      
Buildings, Fixtures and Improvements 0      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 4,309,000      
Accumulated Depreciation 0      
Chuze Fitness [Member] | Highlands Ranch, CO [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 2,850,000      
Buildings, Fixtures and Improvements 4,795,000      
Costs Capitalized Subsequent to Acquisition 2,262,000      
Gross Amount Carried at December 31, 2019 9,907,000      
Accumulated Depreciation (1,311,000)      
PLS Check Cashers [Member] | Grand Prairie, TX [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 385,000      
Buildings, Fixtures and Improvements 1,056,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 1,441,000      
Accumulated Depreciation (313,000)      
PLS Check Cashers [Member] | Kenosha, WI [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 190,000      
Buildings, Fixtures and Improvements 693,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 883,000      
Accumulated Depreciation (226,000)      
PLS Check Cashers [Member] | Tucson, AZ [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 264,000      
Buildings, Fixtures and Improvements 800,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 1,064,000      
Accumulated Depreciation (307,000)      
PLS Check Cashers [Member] | Calumet Park, IL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 306,000      
Buildings, Fixtures and Improvements 1,003,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 1,309,000      
Accumulated Depreciation (367,000)      
PLS Check Cashers [Member] | Chicago, IL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 451,000      
Buildings, Fixtures and Improvements 127,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 578,000      
Accumulated Depreciation (111,000)      
PLS Check Cashers [Member] | Dallas, TX 2 [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 197,000      
Buildings, Fixtures and Improvements 1,356,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 1,553,000      
Accumulated Depreciation (401,000)      
PLS Check Cashers [Member] | Dallas, TX 3 [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 169,000      
Buildings, Fixtures and Improvements 1,180,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 1,349,000      
Accumulated Depreciation (353,000)      
PLS Check Cashers [Member] | Fort Worth, TX [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 187,000      
Buildings, Fixtures and Improvements 1,473,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 1,660,000      
Accumulated Depreciation (422,000)      
PLS Check Cashers [Member] | Houston, TX 2 [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 158,000      
Buildings, Fixtures and Improvements 1,293,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 1,451,000      
Accumulated Depreciation (353,000)      
PLS Check Cashers [Member] | Mesa, AZ [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 187,000      
Buildings, Fixtures and Improvements 759,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 946,000      
Accumulated Depreciation (282,000)      
PLS Check Cashers [Member] | Mesquite, TX [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 261,000      
Buildings, Fixtures and Improvements 1,388,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 1,649,000      
Accumulated Depreciation (440,000)      
PLS Check Cashers [Member] | Phoenix, AZ [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 288,000      
Buildings, Fixtures and Improvements 677,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 965,000      
Accumulated Depreciation (240,000)      
PLS Check Cashers [Member] | Compton, CA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 475,000      
Buildings, Fixtures and Improvements 107,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 582,000      
Accumulated Depreciation (91,000)      
Change Healthcare Operations [Member] | Nashville, TN [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 4,700,000      
Land 688,000      
Buildings, Fixtures and Improvements 10,417,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 11,105,000      
Accumulated Depreciation (2,425,000)      
CarMax [Member] | Austin, TX [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 9,900,000      
Land 5,461,000      
Buildings, Fixtures and Improvements 16,940,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 22,401,000      
Accumulated Depreciation (4,605,000)      
CarMax [Member] | Henderson, NV [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 8,542,000      
Buildings, Fixtures and Improvements 10,396,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 18,938,000      
Accumulated Depreciation (3,144,000)      
BJ's Wholesale Club [Member] | Jacksonville, FL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 0      
Land 5,929,000      
Buildings, Fixtures and Improvements 16,348,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 22,277,000      
Accumulated Depreciation (4,082,000)      
BJ's Wholesale Club [Member] | Deptford, NJ [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 11,004,000      
Land 6,558,000      
Buildings, Fixtures and Improvements 12,490,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 19,048,000      
Accumulated Depreciation (3,104,000)      
BJ's Wholesale Club [Member] | Westminister, MD [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 13,978,000      
Land 6,516,000      
Buildings, Fixtures and Improvements 13,860,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 20,376,000      
Accumulated Depreciation (3,803,000)      
BJ's Wholesale Club [Member] | Pembroke Pines, FL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 8,446,000      
Land 5,104,000      
Buildings, Fixtures and Improvements 7,661,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 12,765,000      
Accumulated Depreciation (2,251,000)      
BJ's Wholesale Club [Member] | Lancaster, PA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2019 13,621,000      
Land 3,400,000      
Buildings, Fixtures and Improvements 16,782,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2019 20,182,000      
Accumulated Depreciation $ (4,456,000)