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Schedule III - Real Estate and Accumulated Depreciation - Section 11 (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 $ 1,917,132,000      
Land 2,884,968,000      
Buildings, Fixtures and Improvements 10,791,126,000      
Costs Capitalized Subsequent to Acquisition (83,654,000)      
Gross Amount Carried at December 31, 2018 13,592,440,000 $ 13,577,700,000 $ 13,539,921,000 $ 14,566,343,000
Accumulated Depreciation (2,622,879,000) $ (2,217,108,000) $ (1,766,006,000) $ (1,331,751,000)
Family Dollar [Member] | San Antonio, TX 6 [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 728,000      
Land 214,000      
Buildings, Fixtures and Improvements 911,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 1,125,000      
Accumulated Depreciation (240,000)      
Family Dollar [Member] | San Antonio, TX 7 [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 1,143,000      
Land 117,000      
Buildings, Fixtures and Improvements 1,619,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 1,736,000      
Accumulated Depreciation (425,000)      
Family Dollar [Member] | San Benito, TX [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 598,000      
Land 132,000      
Buildings, Fixtures and Improvements 772,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 904,000      
Accumulated Depreciation (206,000)      
Family Dollar [Member] | San Diego, TX [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 602,000      
Land 55,000      
Buildings, Fixtures and Improvements 855,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 910,000      
Accumulated Depreciation (226,000)      
Family Dollar [Member] | Seadrift, TX [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 51,000      
Buildings, Fixtures and Improvements 832,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 883,000      
Accumulated Depreciation (156,000)      
Family Dollar [Member] | Somerville, TX [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 131,000      
Buildings, Fixtures and Improvements 743,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 874,000      
Accumulated Depreciation (230,000)      
Family Dollar [Member] | Sonora, TX [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 49,000      
Buildings, Fixtures and Improvements 548,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 597,000      
Accumulated Depreciation (124,000)      
Family Dollar [Member] | Tyler, TX [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 416,000      
Land 132,000      
Buildings, Fixtures and Improvements 554,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 686,000      
Accumulated Depreciation (146,000)      
Family Dollar [Member] | Victoria, TX [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 441,000      
Buildings, Fixtures and Improvements 144,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 585,000      
Accumulated Depreciation (48,000)      
Family Dollar [Member] | Waco, TX [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 440,000      
Land 125,000      
Buildings, Fixtures and Improvements 544,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 669,000      
Accumulated Depreciation (146,000)      
Family Dollar [Member] | Weatherford, TX [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 218,000      
Buildings, Fixtures and Improvements 1,057,000      
Costs Capitalized Subsequent to Acquisition (5,000)      
Gross Amount Carried at December 31, 2018 1,270,000      
Accumulated Depreciation (220,000)      
Family Dollar [Member] | Beaver, UT [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 646,000      
Land 107,000      
Buildings, Fixtures and Improvements 913,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 1,020,000      
Accumulated Depreciation (244,000)      
Family Dollar [Member] | Bristol, VA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 608,000      
Land 104,000      
Buildings, Fixtures and Improvements 837,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 941,000      
Accumulated Depreciation (234,000)      
Family Dollar [Member] | Gretna, VA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 131,000      
Buildings, Fixtures and Improvements 744,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 875,000      
Accumulated Depreciation (219,000)      
Family Dollar [Member] | Hopewell, VA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 430,000      
Buildings, Fixtures and Improvements 987,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 1,417,000      
Accumulated Depreciation (279,000)      
Family Dollar [Member] | Petersburg, VA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 948,000      
Land 142,000      
Buildings, Fixtures and Improvements 1,209,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 1,351,000      
Accumulated Depreciation (338,000)      
Family Dollar [Member] | Stuart, VA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 204,000      
Buildings, Fixtures and Improvements 750,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 954,000      
Accumulated Depreciation (104,000)      
Family Dollar [Member] | Wirtz, VA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 148,000      
Buildings, Fixtures and Improvements 919,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 1,067,000      
Accumulated Depreciation (174,000)      
Family Dollar [Member] | Green Bay, WI [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 304,000      
Buildings, Fixtures and Improvements 1,072,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 1,376,000      
Accumulated Depreciation (290,000)      
Family Dollar [Member] | Markesan, WI [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 92,000      
Buildings, Fixtures and Improvements 831,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 923,000      
Accumulated Depreciation (234,000)      
Family Dollar [Member] | Mayville, WI [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 128,000      
Buildings, Fixtures and Improvements 1,023,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 1,151,000      
Accumulated Depreciation (287,000)      
Family Dollar [Member] | Milwaukee, WI [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 970,000      
Land 161,000      
Buildings, Fixtures and Improvements 1,397,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 1,558,000      
Accumulated Depreciation (362,000)      
Family Dollar [Member] | Thorp, WI [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 90,000      
Buildings, Fixtures and Improvements 810,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 900,000      
Accumulated Depreciation (236,000)      
Family Dollar [Member] | Webster, WI [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 43,000      
Buildings, Fixtures and Improvements 808,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 851,000      
Accumulated Depreciation (237,000)      
Family Dollar [Member] | Alderson, WV [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 166,000      
Buildings, Fixtures and Improvements 663,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 829,000      
Accumulated Depreciation (195,000)      
Family Dollar [Member] | Kemmerer, WY [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 45,000      
Buildings, Fixtures and Improvements 853,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 898,000      
Accumulated Depreciation (261,000)      
Family Dollar [Member] | Mountain View, WY [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 44,000      
Buildings, Fixtures and Improvements 838,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 882,000      
Accumulated Depreciation (242,000)      
Family Dollar [Member] | Torrington, WY [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 72,000      
Buildings, Fixtures and Improvements 645,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 717,000      
Accumulated Depreciation (192,000)      
Family Dollar [Member] | Tulsa, OK [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 220,000      
Buildings, Fixtures and Improvements 878,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 1,098,000      
Accumulated Depreciation (283,000)      
Family Dollar [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, 2018 0      
Land 403,000      
Buildings, Fixtures and Improvements 0      
Costs Capitalized Subsequent to Acquisition 988,000      
Gross Amount Carried at December 31, 2018 1,391,000      
Accumulated Depreciation (146,000)      
Family Dollar [Member] | Jackson, MI [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 93,000      
Buildings, Fixtures and Improvements 525,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 618,000      
Accumulated Depreciation (152,000)      
Family Dollar [Member] | Asheboro, NC [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 251,000      
Buildings, Fixtures and Improvements 932,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 1,183,000      
Accumulated Depreciation (180,000)      
Family Dollar [Member] | Fayetteville, NC [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 267,000      
Buildings, Fixtures and Improvements 682,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 949,000      
Accumulated Depreciation (185,000)      
Family Dollar [Member] | Lumberton, NC [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 151,000      
Buildings, Fixtures and Improvements 603,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 754,000      
Accumulated Depreciation (174,000)      
Family Dollar [Member] | Dallas, TX [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 627,000      
Land 292,000      
Buildings, Fixtures and Improvements 676,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 968,000      
Accumulated Depreciation (188,000)      
Family Dollar [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, 2018 0      
Land 276,000      
Buildings, Fixtures and Improvements 935,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 1,211,000      
Accumulated Depreciation (136,000)      
Family Dollar [Member] | Arlington, TX [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 300,000      
Buildings, Fixtures and Improvements 0      
Costs Capitalized Subsequent to Acquisition 1,058,000      
Gross Amount Carried at December 31, 2018 1,358,000      
Accumulated Depreciation (145,000)      
Family Dollar [Member] | Palatka, FL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 316,000      
Buildings, Fixtures and Improvements 1,054,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 1,370,000      
Accumulated Depreciation (281,000)      
Family Dollar [Member] | Wichita, KS [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 216,000      
Buildings, Fixtures and Improvements 1,035,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 1,251,000      
Accumulated Depreciation (191,000)      
Family Dollar [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, 2018 0      
Land 225,000      
Buildings, Fixtures and Improvements 676,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 901,000      
Accumulated Depreciation (216,000)      
Family Dollar [Member] | Canton, OH [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 460,000      
Land 93,000      
Buildings, Fixtures and Improvements 766,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 859,000      
Accumulated Depreciation (198,000)      
Family Dollar [Member] | Cincinnati, OH [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 221,000      
Buildings, Fixtures and Improvements 1,055,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 1,276,000      
Accumulated Depreciation (211,000)      
Family Dollar [Member] | Cleveland, OH [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 1,079,000      
Land 39,000      
Buildings, Fixtures and Improvements 1,614,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 1,653,000      
Accumulated Depreciation (425,000)      
Family Dollar [Member] | Dayton, OH [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 107,000      
Buildings, Fixtures and Improvements 899,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 1,006,000      
Accumulated Depreciation (212,000)      
Family Dollar [Member] | Dayton, OH 2 [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 129,000      
Buildings, Fixtures and Improvements 618,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 747,000      
Accumulated Depreciation (136,000)      
Family Fare Supermarket [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, 2018 0      
Land 1,393,000      
Buildings, Fixtures and Improvements 7,950,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 9,343,000      
Accumulated Depreciation (2,159,000)      
Farmers Insurance [Member] | Mercer Island, WA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 24,285,000      
Buildings, Fixtures and Improvements 28,210,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 52,495,000      
Accumulated Depreciation (7,038,000)      
Fazoli's [Member] | Carmel, IN [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 427,000      
Buildings, Fixtures and Improvements 522,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 949,000      
Accumulated Depreciation (146,000)      
FedEx [Member] | Homewood, AL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 522,000      
Buildings, Fixtures and Improvements 779,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 1,301,000      
Accumulated Depreciation (231,000)      
FedEx [Member] | Tempe, AZ [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 2,914,000      
Buildings, Fixtures and Improvements 12,300,000      
Costs Capitalized Subsequent to Acquisition 159,000      
Gross Amount Carried at December 31, 2018 15,373,000      
Accumulated Depreciation (2,826,000)      
FedEx [Member] | Yuma, AZ [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 0      
Buildings, Fixtures and Improvements 2,076,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 2,076,000      
Accumulated Depreciation (736,000)      
FedEx [Member] | Chico, CA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 308,000      
Buildings, Fixtures and Improvements 2,776,000      
Costs Capitalized Subsequent to Acquisition 130,000      
Gross Amount Carried at December 31, 2018 3,214,000      
Accumulated Depreciation (967,000)      
FedEx [Member] | Commerce City, CO [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 6,556,000      
Buildings, Fixtures and Improvements 26,224,000      
Costs Capitalized Subsequent to Acquisition 393,000      
Gross Amount Carried at December 31, 2018 33,173,000      
Accumulated Depreciation (9,770,000)      
FedEx [Member] | Melbourne, FL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 159,000      
Buildings, Fixtures and Improvements 1,433,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 1,592,000      
Accumulated Depreciation (461,000)      
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, 2018 0      
Land 733,000      
Buildings, Fixtures and Improvements 1,361,000      
Costs Capitalized Subsequent to Acquisition 183,000      
Gross Amount Carried at December 31, 2018 2,277,000      
Accumulated Depreciation (468,000)      
FedEx [Member] | Ottumwa, IA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 205,000      
Buildings, Fixtures and Improvements 2,552,000      
Costs Capitalized Subsequent to Acquisition 2,749,000      
Gross Amount Carried at December 31, 2018 5,506,000      
Accumulated Depreciation (1,182,000)      
FedEx [Member] | Waterloo, IA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 152,000      
Buildings, Fixtures and Improvements 2,882,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 3,034,000      
Accumulated Depreciation (963,000)      
FedEx [Member] | Effingham, IL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 6,712,000      
Land 1,875,000      
Buildings, Fixtures and Improvements 14,827,000      
Costs Capitalized Subsequent to Acquisition 34,000      
Gross Amount Carried at December 31, 2018 16,736,000      
Accumulated Depreciation (3,449,000)      
FedEx [Member] | Kankakee, IL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 195,000      
Buildings, Fixtures and Improvements 1,103,000      
Costs Capitalized Subsequent to Acquisition 176,000      
Gross Amount Carried at December 31, 2018 1,474,000      
Accumulated Depreciation (430,000)      
FedEx [Member] | Quincy, IL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 371,000      
Buildings, Fixtures and Improvements 2,101,000      
Costs Capitalized Subsequent to Acquisition 3,011,000      
Gross Amount Carried at December 31, 2018 5,483,000      
Accumulated Depreciation (1,150,000)      
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, 2018 0      
Land 665,000      
Buildings, Fixtures and Improvements 2,661,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 3,326,000      
Accumulated Depreciation (972,000)      
FedEx [Member] | Kokomo, IN [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 186,000      
Buildings, Fixtures and Improvements 3,541,000      
Costs Capitalized Subsequent to Acquisition 3,442,000      
Gross Amount Carried at December 31, 2018 7,169,000      
Accumulated Depreciation (1,631,000)      
FedEx [Member] | Lafayette, IN [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 2,126,000      
Land 768,000      
Buildings, Fixtures and Improvements 4,128,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 4,896,000      
Accumulated Depreciation (923,000)      
FedEx [Member] | Independence, KS [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 114,000      
Buildings, Fixtures and Improvements 2,166,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 2,280,000      
Accumulated Depreciation (757,000)      
FedEx [Member] | Hazard, KY [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 215,000      
Buildings, Fixtures and Improvements 4,085,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 4,300,000      
Accumulated Depreciation (1,441,000)      
FedEx [Member] | London, KY 2 [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 350,000      
Buildings, Fixtures and Improvements 3,151,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 3,501,000      
Accumulated Depreciation (985,000)      
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, 2018 0      
Land 295,000      
Buildings, Fixtures and Improvements 6,223,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 6,518,000      
Accumulated Depreciation (1,507,000)      
FedEx [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, 2018 0      
Land 1,797,000      
Buildings, Fixtures and Improvements 7,189,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 8,986,000      
Accumulated Depreciation (2,603,000)      
FedEx [Member] | Port Huron, MI [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 125,000      
Buildings, Fixtures and Improvements 1,121,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 1,246,000      
Accumulated Depreciation (368,000)      
FedEx [Member] | Roseville, MN [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 1,462,000      
Buildings, Fixtures and Improvements 8,282,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 9,744,000      
Accumulated Depreciation (2,871,000)      
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, 2018 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, 2018 6,028,000      
Accumulated Depreciation (966,000)      
FedEx [Member] | Butte, MT [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 403,000      
Buildings, Fixtures and Improvements 7,653,000      
Costs Capitalized Subsequent to Acquisition 4,049,000      
Gross Amount Carried at December 31, 2018 12,105,000      
Accumulated Depreciation (3,251,000)      
FedEx [Member] | Greenville, NC [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 363,000      
Buildings, Fixtures and Improvements 6,903,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 7,266,000      
Accumulated Depreciation (2,584,000)      
FedEx [Member] | Belmont, NH [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 265,000      
Buildings, Fixtures and Improvements 2,386,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 2,651,000      
Accumulated Depreciation (908,000)      
FedEx [Member] | Wendover, NV [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 262,000      
Buildings, Fixtures and Improvements 1,483,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 1,745,000      
Accumulated Depreciation (500,000)      
FedEx [Member] | Blauvelt, NY [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 26,100,000      
Land 14,420,000      
Buildings, Fixtures and Improvements 26,779,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 41,199,000      
Accumulated Depreciation (9,861,000)      
FedEx [Member] | Marcy, NY [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 339,000      
Buildings, Fixtures and Improvements 5,795,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 6,134,000      
Accumulated Depreciation (1,946,000)      
FedEx [Member] | Plattsburg, NY [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 2,614,000      
Land 801,000      
Buildings, Fixtures and Improvements 3,982,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 4,783,000      
Accumulated Depreciation (1,044,000)      
FedEx [Member] | Lebanon, OH [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 1,492,000      
Buildings, Fixtures and Improvements 8,452,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 9,944,000      
Accumulated Depreciation (2,849,000)      
FedEx [Member] | Northwood, OH [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 2,410,000      
Land 674,000      
Buildings, Fixtures and Improvements 5,497,000      
Costs Capitalized Subsequent to Acquisition 486,000      
Gross Amount Carried at December 31, 2018 6,657,000      
Accumulated Depreciation (1,282,000)      
FedEx [Member] | Tulsa, OK [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 458,000      
Buildings, Fixtures and Improvements 8,695,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 9,153,000      
Accumulated Depreciation (3,255,000)      
FedEx [Member] | Tulsa, OK 2 [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 1,476,000      
Buildings, Fixtures and Improvements 18,054,000      
Costs Capitalized Subsequent to Acquisition 555,000      
Gross Amount Carried at December 31, 2018 20,085,000      
Accumulated Depreciation (5,684,000)      
FedEx [Member] | Tinicum, PA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 0      
Buildings, Fixtures and Improvements 32,180,000      
Costs Capitalized Subsequent to Acquisition 549,000      
Gross Amount Carried at December 31, 2018 32,729,000      
Accumulated Depreciation (10,380,000)      
FedEx [Member] | Rapid City, SD [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 305,000      
Buildings, Fixtures and Improvements 2,741,000      
Costs Capitalized Subsequent to Acquisition 4,584,000      
Gross Amount Carried at December 31, 2018 7,630,000      
Accumulated Depreciation (1,428,000)      
FedEx [Member] | Blountvulle, TN [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 562,000      
Buildings, Fixtures and Improvements 5,056,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 5,618,000      
Accumulated Depreciation (1,893,000)      
FedEx [Member] | Humboldt, TN [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 239,000      
Buildings, Fixtures and Improvements 4,543,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 4,782,000      
Accumulated Depreciation (1,631,000)      
FedEx [Member] | Bryan, TX [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 1,422,000      
Buildings, Fixtures and Improvements 4,763,000      
Costs Capitalized Subsequent to Acquisition 34,000      
Gross Amount Carried at December 31, 2018 6,219,000      
Accumulated Depreciation (1,363,000)      
FedEx [Member] | Omak, WA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 252,000      
Buildings, Fixtures and Improvements 1,425,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 1,677,000      
Accumulated Depreciation (503,000)      
FedEx [Member] | Wenatchee, WA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 266,000      
Buildings, Fixtures and Improvements 2,393,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 2,659,000      
Accumulated Depreciation (844,000)      
FedEx [Member] | Menomonee Falls, WI [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 4,215,000      
Buildings, Fixtures and Improvements 14,555,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 18,770,000      
Accumulated Depreciation (2,016,000)      
FedEx [Member] | Parkersburg, WV [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 193,000      
Buildings, Fixtures and Improvements 3,671,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 3,864,000      
Accumulated Depreciation (1,295,000)      
Filiberto's [Member] | Payson, AZ [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 679,000      
Buildings, Fixtures and Improvements 829,000      
Costs Capitalized Subsequent to Acquisition (719,000)      
Gross Amount Carried at December 31, 2018 789,000      
Accumulated Depreciation (26,000)      
Fire Mountain Buffet [Member] | Summerville, SC [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 245,000      
Buildings, Fixtures and Improvements 1,308,000      
Costs Capitalized Subsequent to Acquisition (1,241,000)      
Gross Amount Carried at December 31, 2018 312,000      
Accumulated Depreciation (73,000)      
Fire Mountain Buffet [Member] | Charleston, WV [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 243,000      
Buildings, Fixtures and Improvements 1,305,000      
Costs Capitalized Subsequent to Acquisition (1,228,000)      
Gross Amount Carried at December 31, 2018 320,000      
Accumulated Depreciation (90,000)      
First Bank [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, 2018 0      
Land 1,230,000      
Buildings, Fixtures and Improvements 1,504,000      
Costs Capitalized Subsequent to Acquisition 4,000      
Gross Amount Carried at December 31, 2018 2,738,000      
Accumulated Depreciation (412,000)      
First Bank [Member] | Pinellas Park, FL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 630,000      
Buildings, Fixtures and Improvements 1,470,000      
Costs Capitalized Subsequent to Acquisition 4,000      
Gross Amount Carried at December 31, 2018 2,104,000      
Accumulated Depreciation (403,000)      
Fleming's Steakhouse [Member] | Englewood, CO [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 1,152,000      
Buildings, Fixtures and Improvements 3,055,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 4,207,000      
Accumulated Depreciation (904,000)      
Floor & Decor [Member] | Overland Park, KS [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 2,943,000      
Buildings, Fixtures and Improvements 5,832,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 8,775,000      
Accumulated Depreciation (22,000)      
Floor & Decor [Member] | McDonough, GA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 1,859,000      
Buildings, Fixtures and Improvements 7,711,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 9,570,000      
Accumulated Depreciation (487,000)      
Floor & Decor [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, 2018 0      
Land 3,069,000      
Buildings, Fixtures and Improvements 6,666,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 9,735,000      
Accumulated Depreciation (39,000)      
Floor & Decor [Member] | Riverdale, UT [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 2,920,000      
Buildings, Fixtures and Improvements 5,734,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 8,654,000      
Accumulated Depreciation (160,000)      
Folsom Gateway II [Member] | Folsom, CA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 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, 2018 38,669,000      
Accumulated Depreciation (6,857,000)      
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, 2018 0      
Land 1,269,000      
Buildings, Fixtures and Improvements 2,950,000      
Costs Capitalized Subsequent to Acquisition 265,000      
Gross Amount Carried at December 31, 2018 4,484,000      
Accumulated Depreciation (871,000)      
Forum Energy Technology [Member] | Guthrie, OK [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 393,000      
Buildings, Fixtures and Improvements 1,305,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 1,698,000      
Accumulated Depreciation (278,000)      
Forum Energy Technology [Member] | Gainesville, TX [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 123,000      
Buildings, Fixtures and Improvements 6,019,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 6,142,000      
Accumulated Depreciation (1,248,000)      
Fresenius Medical Care [Member] | Fairhope, AL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 0      
Buildings, Fixtures and Improvements 2,035,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 2,035,000      
Accumulated Depreciation (505,000)      
Fresenius Medical Care [Member] | Foley, AL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 287,000      
Buildings, Fixtures and Improvements 2,580,000      
Costs Capitalized Subsequent to Acquisition (9,000)      
Gross Amount Carried at December 31, 2018 2,858,000      
Accumulated Depreciation (641,000)      
Fresenius Medical Care [Member] | Mobile, AL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 278,000      
Buildings, Fixtures and Improvements 2,505,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 2,783,000      
Accumulated Depreciation (622,000)      
Fresenius Medical Care [Member] | Defuniak Springs, FL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 115,000      
Buildings, Fixtures and Improvements 2,180,000      
Costs Capitalized Subsequent to Acquisition 10,000      
Gross Amount Carried at December 31, 2018 2,305,000      
Accumulated Depreciation (541,000)      
Fresenius Medical Care [Member] | Aurora, IL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 2,294,000      
Land 287,000      
Buildings, Fixtures and Improvements 2,584,000      
Costs Capitalized Subsequent to Acquisition 15,000      
Gross Amount Carried at December 31, 2018 2,886,000      
Accumulated Depreciation (719,000)      
Fresenius Medical Care [Member] | Chicago, IL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 588,000      
Buildings, Fixtures and Improvements 1,764,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 2,352,000      
Accumulated Depreciation (489,000)      
Fresenius Medical Care [Member] | Waukegan, IL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 94,000      
Buildings, Fixtures and Improvements 1,792,000      
Costs Capitalized Subsequent to Acquisition 61,000      
Gross Amount Carried at December 31, 2018 1,947,000      
Accumulated Depreciation (509,000)      
Fresenius Medical Care [Member] | Peru, IN [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 69,000      
Buildings, Fixtures and Improvements 1,305,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 1,374,000      
Accumulated Depreciation (365,000)      
Fresenius Medical Care [Member] | Bossier City, LA 2 [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 120,000      
Buildings, Fixtures and Improvements 682,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 802,000      
Accumulated Depreciation (179,000)      
Fresenius Medical Care [Member] | Caro, MI [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 92,000      
Buildings, Fixtures and Improvements 1,744,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 1,836,000      
Accumulated Depreciation (488,000)      
Fresenius Medical Care [Member] | Jackson, MI [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 1,948,000      
Land 137,000      
Buildings, Fixtures and Improvements 2,603,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 2,740,000      
Accumulated Depreciation (728,000)      
Fresenius Medical Care [Member] | Albemarle, NC [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 139,000      
Buildings, Fixtures and Improvements 1,253,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 1,392,000      
Accumulated Depreciation (320,000)      
Fresenius Medical Care [Member] | Angiers, NC [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 203,000      
Buildings, Fixtures and Improvements 1,152,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 1,355,000      
Accumulated Depreciation (294,000)      
Fresenius Medical Care [Member] | Asheboro, NC [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 2,373,000      
Land 323,000      
Buildings, Fixtures and Improvements 2,903,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 3,226,000      
Accumulated Depreciation (742,000)      
Fresenius Medical Care [Member] | Clinton, NC [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 139,000      
Buildings, Fixtures and Improvements 2,655,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 2,794,000      
Accumulated Depreciation (664,000)      
Fresenius Medical Care [Member] | Fairmont, NC [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 201,000      
Buildings, Fixtures and Improvements 1,819,000      
Costs Capitalized Subsequent to Acquisition 6,000      
Gross Amount Carried at December 31, 2018 2,026,000      
Accumulated Depreciation (455,000)      
Fresenius Medical Care [Member] | Fayetteville, NC [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 420,000      
Buildings, Fixtures and Improvements 2,379,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 2,799,000      
Accumulated Depreciation (596,000)      
Fresenius Medical Care [Member] | Fayetteville, NC 2 [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 134,000      
Buildings, Fixtures and Improvements 2,551,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 2,685,000      
Accumulated Depreciation (640,000)      
Fresenius Medical Care [Member] | Fayetteville, NC 3 [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 178,000      
Buildings, Fixtures and Improvements 3,379,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 3,557,000      
Accumulated Depreciation (847,000)      
Fresenius Medical Care [Member] | Lumberton, NC [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 117,000      
Buildings, Fixtures and Improvements 2,216,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 2,333,000      
Accumulated Depreciation (556,000)      
Fresenius Medical Care [Member] | Pembroke, NC [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 81,000      
Buildings, Fixtures and Improvements 1,547,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 1,628,000      
Accumulated Depreciation (388,000)      
Fresenius Medical Care [Member] | Red Springs, NC [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 101,000      
Buildings, Fixtures and Improvements 1,913,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 2,014,000      
Accumulated Depreciation (480,000)      
Fresenius Medical Care [Member] | Roseboro, NC [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 74,000      
Buildings, Fixtures and Improvements 1,404,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 1,478,000      
Accumulated Depreciation (352,000)      
Fresenius Medical Care [Member] | St. Pauls, NC [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 73,000      
Buildings, Fixtures and Improvements 1,389,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 1,462,000      
Accumulated Depreciation (348,000)      
Fresenius Medical Care [Member] | Taylorsville, NC [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 275,000      
Buildings, Fixtures and Improvements 1,099,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 1,374,000      
Accumulated Depreciation (281,000)      
Fresenius Medical Care [Member] | Kings Mills, OH [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 399,000      
Buildings, Fixtures and Improvements 598,000      
Costs Capitalized Subsequent to Acquisition 6,000      
Gross Amount Carried at December 31, 2018 1,003,000      
Accumulated Depreciation (171,000)      
Fresenius Medical Care [Member] | Dallas, TX [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 377,000      
Buildings, Fixtures and Improvements 1,132,000      
Costs Capitalized Subsequent to Acquisition 81,000      
Gross Amount Carried at December 31, 2018 1,590,000      
Accumulated Depreciation (282,000)      
The Fresh Market [Member] | Winston-Salem, NC [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 196,000      
Buildings, Fixtures and Improvements 4,562,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 4,758,000      
Accumulated Depreciation (1,061,000)      
Fresh Thyme Farmers Market [Member] | Canton, MI [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 1,361,000      
Buildings, Fixtures and Improvements 6,976,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 8,337,000      
Accumulated Depreciation (350,000)      
Fun Town RV | Cleburne, TX [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 262,000      
Buildings, Fixtures and Improvements 369,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 631,000      
Accumulated Depreciation (85,000)      
Fun Town RV | Cleburne, TX 2 [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 70,000      
Buildings, Fixtures and Improvements 0      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 70,000      
Accumulated Depreciation 0      
Furr's [Member] | Garland, TX [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 1,529,000      
Buildings, Fixtures and Improvements 3,715,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 5,244,000      
Accumulated Depreciation (1,128,000)      
Gastro Pub [Member] | Tulsa, OK 3 [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 1,253,000      
Buildings, Fixtures and Improvements 70,274,000      
Costs Capitalized Subsequent to Acquisition 1,869,000      
Gross Amount Carried at December 31, 2018 73,396,000      
Accumulated Depreciation (17,333,000)      
GE Aviation [Member] | Auburn, AL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 24,133,000      
Land 1,627,000      
Buildings, Fixtures and Improvements 30,920,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 32,547,000      
Accumulated Depreciation (9,087,000)      
GE Engine [Member] | Winfield, KS [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 1,078,000      
Buildings, Fixtures and Improvements 5,087,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 6,165,000      
Accumulated Depreciation (4,092,000)      
General Electric [Member] | Longmont, CO [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 1,402,000      
Buildings, Fixtures and Improvements 15,640,000      
Costs Capitalized Subsequent to Acquisition 1,258,000      
Gross Amount Carried at December 31, 2018 18,300,000      
Accumulated Depreciation (5,022,000)      
General Mills [Member] | Geneva, IL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 7,457,000      
Buildings, Fixtures and Improvements 22,371,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 29,828,000      
Accumulated Depreciation (8,169,000)      
General Mills [Member] | Fort Wayne, IN [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 2,533,000      
Buildings, Fixtures and Improvements 48,130,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 50,663,000      
Accumulated Depreciation (16,832,000)      
General Service Administration [Member] | Mobile, AL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 268,000      
Buildings, Fixtures and Improvements 5,095,000      
Costs Capitalized Subsequent to Acquisition 49,000      
Gross Amount Carried at December 31, 2018 5,412,000      
Accumulated Depreciation (1,681,000)      
General Service Administration [Member] | Craig, CO [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 129,000      
Buildings, Fixtures and Improvements 1,159,000      
Costs Capitalized Subsequent to Acquisition 16,000      
Gross Amount Carried at December 31, 2018 1,304,000      
Accumulated Depreciation (404,000)      
General Service Administration [Member] | Cocoa, FL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 500,000      
Land 253,000      
Buildings, Fixtures and Improvements 1,435,000      
Costs Capitalized Subsequent to Acquisition 15,000      
Gross Amount Carried at December 31, 2018 1,703,000      
Accumulated Depreciation (501,000)      
General Service Administration [Member] | Grangeville, ID [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 2,100,000      
Land 317,000      
Buildings, Fixtures and Improvements 6,023,000      
Costs Capitalized Subsequent to Acquisition 27,000      
Gross Amount Carried at December 31, 2018 6,367,000      
Accumulated Depreciation (2,036,000)      
General Service Administration [Member] | Freeport, NY [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 843,000      
Buildings, Fixtures and Improvements 3,372,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 4,215,000      
Accumulated Depreciation (1,158,000)      
General Service Administration [Member] | Plattsburgh, NY [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 508,000      
Buildings, Fixtures and Improvements 4,572,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 5,080,000      
Accumulated Depreciation (1,504,000)      
General Service Administration [Member] | Warren, PA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 341,000      
Buildings, Fixtures and Improvements 3,114,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 3,455,000      
Accumulated Depreciation (1,030,000)      
General Service Administration [Member] | Ponce, PR [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 1,780,000      
Buildings, Fixtures and Improvements 9,313,000      
Costs Capitalized Subsequent to Acquisition (4,565,000)      
Gross Amount Carried at December 31, 2018 6,528,000      
Accumulated Depreciation (698,000)      
General Service Administration [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, 2018 0      
Land 477,000      
Buildings, Fixtures and Improvements 4,294,000      
Costs Capitalized Subsequent to Acquisition (4,000)      
Gross Amount Carried at December 31, 2018 4,767,000      
Accumulated Depreciation (1,424,000)      
General Service Administration [Member] | Gloucester, VA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 287,000      
Buildings, Fixtures and Improvements 1,628,000      
Costs Capitalized Subsequent to Acquisition 8,000      
Gross Amount Carried at December 31, 2018 1,923,000      
Accumulated Depreciation (536,000)      
Giant [Member] | Levittown, PA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 4,716,000      
Buildings, Fixtures and Improvements 9,955,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 14,671,000      
Accumulated Depreciation (2,524,000)      
Giant Eagle [Member] | Gahanna, OH [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 3,549,000      
Buildings, Fixtures and Improvements 16,736,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 20,285,000      
Accumulated Depreciation (3,848,000)      
Giant Eagle [Member] | Lancaster, OH [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 2,210,000      
Buildings, Fixtures and Improvements 15,649,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 17,859,000      
Accumulated Depreciation (3,498,000)      
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, 2018 0      
Land 294,000      
Buildings, Fixtures and Improvements 6,694,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 6,988,000      
Accumulated Depreciation (1,709,000)      
GM Financial [Member] | Arlington, TX [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 7,901,000      
Buildings, Fixtures and Improvements 35,553,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 43,454,000      
Accumulated Depreciation (9,485,000)      
Golden Corral [Member] | Bristol, VA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 750,000      
Buildings, Fixtures and Improvements 2,276,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 3,026,000      
Accumulated Depreciation (685,000)      
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, 2018 0      
Land 670,000      
Buildings, Fixtures and Improvements 2,707,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 3,377,000      
Accumulated Depreciation (815,000)      
Golden Corral [Member] | Kokomo, IN [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 780,000      
Buildings, Fixtures and Improvements 2,107,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 2,887,000      
Accumulated Depreciation (634,000)      
Golden Corral [Member] | Tulsa, OK [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 280,000      
Buildings, Fixtures and Improvements 3,890,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 4,170,000      
Accumulated Depreciation (1,171,000)      
Golden Corral [Member] | Cullman, AL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 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, 2018 1,094,000      
Accumulated Depreciation (150,000)      
Golden Corral [Member] | Gilbert, AZ [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 871,000      
Buildings, Fixtures and Improvements 2,910,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 3,781,000      
Accumulated Depreciation (884,000)      
Golden Corral [Member] | Goodyear, AZ [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 686,000      
Buildings, Fixtures and Improvements 1,939,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 2,625,000      
Accumulated Depreciation (589,000)      
Golden Corral [Member] | Surprise, AZ [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 1,258,000      
Buildings, Fixtures and Improvements 4,068,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 5,326,000      
Accumulated Depreciation (1,235,000)      
Golden Corral [Member] | Bakersfield, CA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 2,664,000      
Buildings, Fixtures and Improvements 2,078,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 4,742,000      
Accumulated Depreciation (671,000)      
Golden Corral [Member] | Palatka, FL [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 853,000      
Buildings, Fixtures and Improvements 1,048,000      
Costs Capitalized Subsequent to Acquisition (471,000)      
Gross Amount Carried at December 31, 2018 1,430,000      
Accumulated Depreciation (157,000)      
Golden Corral [Member] | Albany, GA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 460,000      
Buildings, Fixtures and Improvements 1,863,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 2,323,000      
Accumulated Depreciation (561,000)      
Golden Corral [Member] | Brunswick, GA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 390,000      
Buildings, Fixtures and Improvements 2,093,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 2,483,000      
Accumulated Depreciation (630,000)      
Golden Corral [Member] | Council Bluffs, IA [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 1,140,000      
Buildings, Fixtures and Improvements 1,460,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 2,600,000      
Accumulated Depreciation (440,000)      
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, 2018 0      
Land 1,061,000      
Buildings, Fixtures and Improvements 1,344,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 2,405,000      
Accumulated Depreciation (502,000)      
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, 2018 0      
Land 728,000      
Buildings, Fixtures and Improvements 723,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 1,451,000      
Accumulated Depreciation (233,000)      
Golden Corral [Member] | Wichita, KS [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 560,000      
Buildings, Fixtures and Improvements 1,306,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 1,866,000      
Accumulated Depreciation (366,000)      
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, 2018 0      
Land 600,000      
Buildings, Fixtures and Improvements 1,586,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 2,186,000      
Accumulated Depreciation (477,000)      
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, 2018 0      
Land 1,020,000      
Buildings, Fixtures and Improvements 1,173,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 2,193,000      
Accumulated Depreciation (347,000)      
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, 2018 0      
Land 1,244,000      
Buildings, Fixtures and Improvements 1,656,000      
Costs Capitalized Subsequent to Acquisition (1,941,000)      
Gross Amount Carried at December 31, 2018 959,000      
Accumulated Depreciation (112,000)      
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, 2018 0      
Land 1,611,000      
Buildings, Fixtures and Improvements 2,188,000      
Costs Capitalized Subsequent to Acquisition (2,893,000)      
Gross Amount Carried at December 31, 2018 906,000      
Accumulated Depreciation (94,000)      
Golden Corral [Member] | Independence, MO [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 1,425,000      
Buildings, Fixtures and Improvements 2,437,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 3,862,000      
Accumulated Depreciation (722,000)      
Golden Corral [Member] | Flowood, MS [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 680,000      
Buildings, Fixtures and Improvements 2,730,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 3,410,000      
Accumulated Depreciation (822,000)      
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, 2018 0      
Land 925,000      
Buildings, Fixtures and Improvements 2,463,000      
Costs Capitalized Subsequent to Acquisition (2,319,000)      
Gross Amount Carried at December 31, 2018 1,069,000      
Accumulated Depreciation (147,000)      
Golden Corral [Member] | Aberdeen, NC [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 690,000      
Buildings, Fixtures and Improvements 1,566,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 2,256,000      
Accumulated Depreciation (471,000)      
Golden Corral [Member] | Bellevue, NE [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 520,000      
Buildings, Fixtures and Improvements 1,433,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 1,953,000      
Accumulated Depreciation (431,000)      
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, 2018 0      
Land 300,000      
Buildings, Fixtures and Improvements 2,930,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 3,230,000      
Accumulated Depreciation (882,000)      
Golden Corral [Member] | Farmington, NM [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 270,000      
Buildings, Fixtures and Improvements 3,174,000      
Costs Capitalized Subsequent to Acquisition (2,023,000)      
Gross Amount Carried at December 31, 2018 1,421,000      
Accumulated Depreciation (166,000)      
Golden Corral [Member] | Akron, OH [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 640,000      
Buildings, Fixtures and Improvements 2,133,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 2,773,000      
Accumulated Depreciation (550,000)      
Golden Corral [Member] | Beavercreek, OH [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 713,000      
Buildings, Fixtures and Improvements 1,858,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 2,571,000      
Accumulated Depreciation (462,000)      
Golden Corral [Member] | Canton, OH [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 647,000      
Buildings, Fixtures and Improvements 2,135,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 2,782,000      
Accumulated Depreciation (584,000)      
Golden Corral [Member] | Cincinnati, OH [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 694,000      
Buildings, Fixtures and Improvements 2,066,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 2,760,000      
Accumulated Depreciation (558,000)      
Golden Corral [Member] | Cleveland, OH [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 1,109,000      
Buildings, Fixtures and Improvements 2,315,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 3,424,000      
Accumulated Depreciation (581,000)      
Golden Corral [Member] | Columbus, OH [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 770,000      
Buildings, Fixtures and Improvements 2,476,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 3,246,000      
Accumulated Depreciation (745,000)      
Golden Corral [Member] | Dayton, OH [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 579,000      
Buildings, Fixtures and Improvements 1,429,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 2,008,000      
Accumulated Depreciation (388,000)      
Golden Corral [Member] | Dayton, OH 2 [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2018 0      
Land 774,000      
Buildings, Fixtures and Improvements 2,766,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2018 3,540,000      
Accumulated Depreciation $ (734,000)