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Schedule III-Real Estate and Accumulated Depreciation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 22, 2020
Dec. 31, 2019
Initial Cost          
Land     $ 97,030    
Building and Improvements     348,667    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     19,117    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     99,544    
Building and Improvements     365,270    
Total $ 468,499 $ 482,103 464,814   $ 468,499
Accumulated Depreciation     59,685    
Mortgage note     334,266   340,913
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at beginning of period 468,499 482,103      
Acquisitions 0 35      
Improvements 3,066 2,711      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Write-down or Reserve, Amount (600) (1,598)      
Disposals (6,151) (14,752)      
Balance at end of period 464,814 $ 468,499      
Georgetown Ridgeland Lagrange          
Gross Amount at which Carried at End of Period          
Mortgage note     5,600    
Berkley/Sangaree/Tri-County          
Gross Amount at which Carried at End of Period          
Mortgage note     9,400   9,400
Beaver Village I and II          
Gross Amount at which Carried at End of Period          
Mortgage note     9,400   9,400
Ladson Crossing, Lake Greenwood and South Park          
Gross Amount at which Carried at End of Period          
Mortgage note     7,200    
Litchfield I, Litchfield II, Litchfield Market Village          
Gross Amount at which Carried at End of Period          
Mortgage note     7,400    
Mortgages | Berkley/Sangaree/Tri-County          
Gross Amount at which Carried at End of Period          
Mortgage note     9,400    
Mortgages | Beaver Village I and II          
Gross Amount at which Carried at End of Period          
Mortgage note     9,400    
Mortgages | Powerscourt Financing Agreement          
Gross Amount at which Carried at End of Period          
Mortgage note     25,000    
Line of Credit          
Gross Amount at which Carried at End of Period          
Mortgage note     1,100    
Line of Credit | KeyBank          
Gross Amount at which Carried at End of Period          
Mortgage note     0   17,879
Line of Credit | Powerscourt Financing Agreement          
Gross Amount at which Carried at End of Period          
Mortgage note     25,000 $ 25,000 $ 0
Amscot Building          
Initial Cost          
Land     0    
Building and Improvements     462    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     31    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     0    
Building and Improvements     493    
Total $ 493   493    
Accumulated Depreciation     243    
Date of Construction May 15, 2004        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 493        
Amscot Building | Line of Credit          
Gross Amount at which Carried at End of Period          
Mortgage note     1,200    
Amscot Building | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Amscot Building | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Lumber River Plaza          
Initial Cost          
Land     800    
Building and Improvements     4,487    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     151    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     942    
Building and Improvements     4,496    
Total $ 5,438   5,438    
Encumbrances     1,367    
Accumulated Depreciation     1,144    
Date Acquired Nov. 16, 2012        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 5,438        
Lumber River Plaza | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Lumber River Plaza | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Surrey Plaza          
Initial Cost          
Land     381    
Building and Improvements     1,857    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     0    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     381    
Building and Improvements     1,857    
Total $ 2,238   2,238    
Accumulated Depreciation     535    
Date Acquired Dec. 21, 2012        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 2,238        
Surrey Plaza | Line of Credit          
Gross Amount at which Carried at End of Period          
Mortgage note     1,200    
Surrey Plaza | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Surrey Plaza | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Tuckernuck          
Initial Cost          
Land     2,115    
Building and Improvements     6,719    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     1,009    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     2,171    
Building and Improvements     7,672    
Total $ 9,843   9,843    
Encumbrances     5,193    
Accumulated Depreciation     1,902    
Date Acquired Nov. 16, 2012        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 9,843        
Tuckernuck | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Tuckernuck | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Twin City Commons          
Initial Cost          
Land     800    
Building and Improvements     3,041    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     142    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     800    
Building and Improvements     3,183    
Total $ 3,983   3,983    
Encumbrances     2,915    
Accumulated Depreciation     795    
Date Acquired Dec. 18, 2012        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 3,983        
Twin City Commons | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Twin City Commons | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Walnut Hill Plaza          
Initial Cost          
Land     734    
Building and Improvements     2,414    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     1,334    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     734    
Building and Improvements     3,748    
Total $ 4,482   4,482    
Encumbrances     3,287    
Accumulated Depreciation     2,373    
Date Acquired Dec. 14, 2007        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 4,482        
Walnut Hill Plaza | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Walnut Hill Plaza | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 15 years        
Tampa Festival          
Initial Cost          
Land     4,653    
Building and Improvements     6,691    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     442    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     4,695    
Building and Improvements     7,091    
Total $ 11,786   11,786    
Encumbrances     7,920    
Accumulated Depreciation     1,891    
Date Acquired Aug. 26, 2013        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 11,786        
Tampa Festival | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Tampa Festival | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Forrest Gallery          
Initial Cost          
Land     3,015    
Building and Improvements     7,455    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     1,081    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     3,015    
Building and Improvements     8,536    
Total $ 11,551   11,551    
Encumbrances     8,226    
Accumulated Depreciation     2,215    
Date Acquired Aug. 29, 2013        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 11,551        
Forrest Gallery | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Forrest Gallery | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Winslow Plaza          
Initial Cost          
Land     1,325    
Building and Improvements     3,684    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     210    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     1,370    
Building and Improvements     3,849    
Total $ 5,219   5,219    
Encumbrances     4,553    
Accumulated Depreciation     992    
Date Acquired Dec. 19, 2013        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 5,219        
Winslow Plaza | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Winslow Plaza | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Clover Plaza          
Initial Cost          
Land     356    
Building and Improvements     1,197    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     29    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     356    
Building and Improvements     1,226    
Total $ 1,582   1,582    
Encumbrances     1,951    
Accumulated Depreciation     243    
Date Acquired Dec. 23, 2013        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 1,582        
Clover Plaza | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Clover Plaza | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
St George Plaza          
Initial Cost          
Land     706    
Building and Improvements     1,264    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     69    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     752    
Building and Improvements     1,287    
Total $ 2,039   2,039    
Encumbrances     2,460    
Accumulated Depreciation     264    
Date Acquired Dec. 23, 2013        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 2,039        
St George Plaza | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
St George Plaza | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
South Square          
Initial Cost          
Land     353    
Building and Improvements     1,911    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     31    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     374    
Building and Improvements     1,921    
Total $ 2,295   2,295    
Encumbrances     2,003    
Accumulated Depreciation     356    
Date Acquired Dec. 23, 2013        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 2,295        
South Square | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
South Square | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Westland Square          
Initial Cost          
Land     887    
Building and Improvements     1,710    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     36    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     901    
Building and Improvements     1,732    
Total $ 2,633   2,633    
Encumbrances     2,556    
Accumulated Depreciation     334    
Date Acquired Dec. 23, 2013        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 2,633        
Westland Square | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Westland Square | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Waterway Plaza          
Initial Cost          
Land     1,280    
Building and Improvements     1,248    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     214    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     1,299    
Building and Improvements     1,443    
Total $ 2,742   2,742    
Encumbrances     2,503    
Accumulated Depreciation     271    
Date Acquired Dec. 23, 2013        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 2,742        
Waterway Plaza | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Waterway Plaza | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Cypress Shopping Center          
Initial Cost          
Land     2,064    
Building and Improvements     4,579    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     476    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     2,064    
Building and Improvements     5,055    
Total $ 7,119   7,119    
Encumbrances     6,163    
Accumulated Depreciation     891    
Date Acquired Jul. 01, 2014        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 7,119        
Cypress Shopping Center | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Cypress Shopping Center | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Harrodsburg Marketplace          
Initial Cost          
Land     1,431    
Building and Improvements     2,485    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     72    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     1,509    
Building and Improvements     2,479    
Total $ 3,988   3,988    
Encumbrances     3,343    
Accumulated Depreciation     484    
Date Acquired Jul. 01, 2014        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 3,988        
Harrodsburg Marketplace | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Harrodsburg Marketplace | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Port Crossing Shopping Center          
Initial Cost          
Land     792    
Building and Improvements     6,921    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     167    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     792    
Building and Improvements     7,088    
Total $ 7,880   7,880    
Encumbrances     5,909    
Accumulated Depreciation     1,883    
Date Acquired Jul. 03, 2014        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 7,880        
Port Crossing Shopping Center | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Port Crossing Shopping Center | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
LaGrange Marketplace          
Initial Cost          
Land     390    
Building and Improvements     2,648    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     277    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     430    
Building and Improvements     2,885    
Total $ 3,315   3,315    
Accumulated Depreciation     595    
Date Acquired Jul. 25, 2014        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 3,315        
LaGrange Marketplace | Georgetown Ridgeland Lagrange          
Gross Amount at which Carried at End of Period          
Mortgage note     5,600    
LaGrange Marketplace | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
LaGrange Marketplace | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
DF I-Courtland (undeveloped land)          
Initial Cost          
Land     196    
Building and Improvements     0    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     0    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     196    
Building and Improvements     0    
Total $ 196   196    
Date Acquired Aug. 15, 2014        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 196        
Edenton Commons (undeveloped land)          
Initial Cost          
Land     746    
Building and Improvements     0    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     0    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     746    
Building and Improvements     0    
Total $ 746   746    
Date Acquired Aug. 15, 2014        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 746        
DF I-Moyock (undeveloped land)          
Initial Cost          
Land     179    
Building and Improvements     0    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     0    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     179    
Building and Improvements     0    
Total $ 179   179    
Date Acquired Aug. 15, 2014        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 179        
Freeway Junction          
Initial Cost          
Land     1,521    
Building and Improvements     6,755    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     152    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     1,521    
Building and Improvements     6,907    
Total $ 8,428   8,428    
Encumbrances     7,582    
Accumulated Depreciation     1,360    
Date Acquired Sep. 04, 2014        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 8,428        
Freeway Junction | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Freeway Junction | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Bryan Station          
Initial Cost          
Land     1,658    
Building and Improvements     2,756    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     85    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     1,658    
Building and Improvements     2,841    
Total $ 4,499   4,499    
Encumbrances     4,312    
Accumulated Depreciation     550    
Date Acquired Oct. 02, 2014        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 4,499        
Bryan Station | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Bryan Station | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Crockett Square          
Initial Cost          
Land     1,546    
Building and Improvements     6,834    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     183    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     1,565    
Building and Improvements     6,998    
Total $ 8,563   8,563    
Encumbrances     6,338    
Accumulated Depreciation     1,403    
Date Acquired Nov. 05, 2014        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 8,563        
Crockett Square | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Crockett Square | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Harbor Pointe (undeveloped land)          
Gross Amount at which Carried at End of Period          
Date Acquired Nov. 21, 2014        
Harbor Point          
Initial Cost          
Land     1,538    
Building and Improvements     0    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     (359)    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     1,179    
Building and Improvements     0    
Total $ 1,179   1,179    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period 1,179        
DF I-Berkley (undeveloped land)          
Initial Cost          
Land     250    
Building and Improvements     0    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     0    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     250    
Building and Improvements     0    
Total $ 250   250    
Date Acquired Dec. 01, 2014        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 250        
Pierpont Centre          
Initial Cost          
Land     484    
Building and Improvements     9,221    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     171    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     676    
Building and Improvements     9,200    
Total $ 9,876   9,876    
Encumbrances     8,001    
Accumulated Depreciation     1,673    
Date Acquired Jan. 14, 2015        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 9,876        
Pierpont Centre | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Pierpont Centre | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Brook Run Properties (undeveloped land)          
Initial Cost          
Land     300    
Building and Improvements     0    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     8    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     300    
Building and Improvements     8    
Total $ 308   308    
Date Acquired Mar. 27, 2015        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 308        
Alex City Marketplace          
Initial Cost          
Land     454    
Building and Improvements     7,837    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     1,610    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     716    
Building and Improvements     9,185    
Total $ 9,901   9,901    
Encumbrances     5,750    
Accumulated Depreciation     1,658    
Date Acquired Apr. 01, 2015        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 9,901        
Alex City Marketplace | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Alex City Marketplace | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Butler Square          
Initial Cost          
Land     1,024    
Building and Improvements     6,401    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     224    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     1,024    
Building and Improvements     6,625    
Total $ 7,649   7,649    
Encumbrances     5,640    
Accumulated Depreciation     1,051    
Date Acquired Apr. 15, 2015        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 7,649        
Butler Square | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Butler Square | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Brook Run Shopping Center          
Initial Cost          
Land     2,209    
Building and Improvements     12,919    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     593    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     2,377    
Building and Improvements     13,344    
Total $ 15,721   15,721    
Encumbrances     10,950    
Accumulated Depreciation     3,708    
Date Acquired Jun. 02, 2015        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 15,721        
Brook Run Shopping Center | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Brook Run Shopping Center | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Beaver Ruin Village          
Initial Cost          
Land     2,604    
Building and Improvements     8,284    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     102    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     2,604    
Building and Improvements     8,386    
Total $ 10,990   10,990    
Accumulated Depreciation     1,296    
Date Acquired Jul. 01, 2015        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 10,990        
Beaver Ruin Village | Mortgages | Beaver Village I and II          
Gross Amount at which Carried at End of Period          
Mortgage note     9,400    
Beaver Ruin Village | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Beaver Ruin Village | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Beaver Ruin Village II          
Initial Cost          
Land     1,153    
Building and Improvements     2,809    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     5    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     1,153    
Building and Improvements     2,814    
Total $ 3,967   3,967    
Accumulated Depreciation     435    
Date Acquired Jul. 01, 2015        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 3,967        
Beaver Ruin Village II | Mortgages | Beaver Village I and II          
Gross Amount at which Carried at End of Period          
Mortgage note     9,400    
Beaver Ruin Village II | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Beaver Ruin Village II | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Columbia Fire Station          
Initial Cost          
Land     1,106    
Building and Improvements     599    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     4,719    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     1,106    
Building and Improvements     5,318    
Total $ 6,424   6,424    
Encumbrances     3,893    
Accumulated Depreciation     235    
Date of Construction Aug. 31, 2018        
Date Acquired Jul. 01, 2015        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 6,424        
Columbia Fire Station | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Columbia Fire Station | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Chesapeake Square          
Initial Cost          
Land     895    
Building and Improvements     4,112    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     966    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     1,269    
Building and Improvements     4,704    
Total $ 5,973   5,973    
Encumbrances     4,279    
Accumulated Depreciation     1,009    
Date Acquired Jul. 10, 2015        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 5,973        
Chesapeake Square | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Chesapeake Square | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Sunshine Shopping Center          
Initial Cost          
Land     1,183    
Building and Improvements     6,368    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     500    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     1,222    
Building and Improvements     6,829    
Total $ 8,051   8,051    
Encumbrances     5,900    
Accumulated Depreciation     1,066    
Date Acquired Jul. 21, 2015        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 8,051        
Sunshine Shopping Center | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Sunshine Shopping Center | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Barnett Portfolio          
Initial Cost          
Land     3,107    
Building and Improvements     8,912    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     281    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     3,234    
Building and Improvements     9,066    
Total $ 12,300   12,300    
Encumbrances     8,770    
Accumulated Depreciation     1,570    
Date Acquired Aug. 21, 2015        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 12,300        
Barnett Portfolio | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Barnett Portfolio | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Grove Park Shopping Center          
Initial Cost          
Land     722    
Building and Improvements     4,590    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     84    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     741    
Building and Improvements     4,655    
Total $ 5,396   5,396    
Encumbrances     3,800    
Accumulated Depreciation     849    
Date Acquired Sep. 09, 2015        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 5,396        
Grove Park Shopping Center | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Grove Park Shopping Center | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Parkway Plaza          
Initial Cost          
Land     772    
Building and Improvements     4,230    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     32    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     778    
Building and Improvements     4,256    
Total $ 5,034   5,034    
Encumbrances     3,500    
Accumulated Depreciation     680    
Date Acquired Sep. 15, 2015        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 5,034        
Parkway Plaza | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Parkway Plaza | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Fort Howard Shopping Center          
Initial Cost          
Land     1,890    
Building and Improvements     7,350    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     212    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     1,952    
Building and Improvements     7,500    
Total $ 9,452   9,452    
Encumbrances     7,100    
Accumulated Depreciation     1,126    
Date Acquired Sep. 30, 2015        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 9,452        
Fort Howard Shopping Center | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Fort Howard Shopping Center | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Conyers Crossing          
Initial Cost          
Land     2,034    
Building and Improvements     6,820    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     94    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     2,034    
Building and Improvements     6,914    
Total $ 8,948   8,948    
Encumbrances     5,960    
Accumulated Depreciation     1,301    
Date Acquired Sep. 30, 2015        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 8,948        
Conyers Crossing | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Conyers Crossing | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Darien Shopping Center          
Initial Cost          
Land     188    
Building and Improvements     1,054    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     0    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     188    
Building and Improvements     1,054    
Total $ 1,242   1,242    
Accumulated Depreciation     144    
Date Acquired Apr. 12, 2016        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 1,242        
Darien Shopping Center | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Darien Shopping Center | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Devine Street          
Initial Cost          
Land     365    
Building and Improvements     1,941    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     0    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     365    
Building and Improvements     1,941    
Total $ 2,306   2,306    
Accumulated Depreciation     252    
Date Acquired Apr. 12, 2016        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 2,306        
Devine Street | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Devine Street | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Folly Road          
Initial Cost          
Land     5,992    
Building and Improvements     4,527    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     0    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     5,992    
Building and Improvements     4,527    
Total $ 10,519   10,519    
Encumbrances     7,223    
Accumulated Depreciation     608    
Date Acquired Apr. 12, 2016        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 10,519        
Folly Road | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Folly Road | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Georgetown          
Initial Cost          
Land     742    
Building and Improvements     1,917    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     93    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     742    
Building and Improvements     2,010    
Total $ 2,752   2,752    
Accumulated Depreciation     272    
Date Acquired Apr. 12, 2016        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 2,752        
Georgetown | Georgetown Ridgeland Lagrange          
Gross Amount at which Carried at End of Period          
Mortgage note     5,600    
Georgetown | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Georgetown | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Ladson Crossing          
Initial Cost          
Land     2,981    
Building and Improvements     3,920    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     64    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     3,052    
Building and Improvements     3,913    
Total $ 6,965   6,965    
Accumulated Depreciation     553    
Date Acquired Apr. 12, 2016        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 6,965        
Ladson Crossing | Ladson Crossing, Lake Greenwood and South Park          
Gross Amount at which Carried at End of Period          
Mortgage note     7,400    
Ladson Crossing | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Ladson Crossing | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Lake Greenwood Crossing          
Initial Cost          
Land     550    
Building and Improvements     2,499    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     17    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     550    
Building and Improvements     2,516    
Total $ 3,066   3,066    
Accumulated Depreciation     343    
Date Acquired Apr. 12, 2016        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 3,066        
Lake Greenwood Crossing | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Lake Greenwood Crossing | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Lake Murray          
Initial Cost          
Land     447    
Building and Improvements     1,537    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     0    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     447    
Building and Improvements     1,537    
Total $ 1,984   1,984    
Accumulated Depreciation     236    
Date Acquired Apr. 12, 2016        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 1,984        
Lake Murray | Ladson Crossing, Lake Greenwood and South Park          
Gross Amount at which Carried at End of Period          
Mortgage note     7,400    
Lake Murray | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Lake Murray | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Litchfield I          
Initial Cost          
Land     568    
Building and Improvements     929    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     61    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     572    
Building and Improvements     986    
Total $ 1,558   1,558    
Accumulated Depreciation     160    
Date Acquired Apr. 12, 2016        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 1,558        
Litchfield I | Litchfield I, Litchfield II, Litchfield Market Village          
Gross Amount at which Carried at End of Period          
Mortgage note     7,500    
Litchfield I | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Litchfield I | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Litchfield II          
Initial Cost          
Land     568    
Building and Improvements     936    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     24    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     572    
Building and Improvements     956    
Total $ 1,528   1,528    
Accumulated Depreciation     132    
Date Acquired Apr. 12, 2016        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 1,528        
Litchfield II | Litchfield I, Litchfield II, Litchfield Market Village          
Gross Amount at which Carried at End of Period          
Mortgage note     7,500    
Litchfield II | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Litchfield II | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Litchfield Market Village          
Initial Cost          
Land     2,970    
Building and Improvements     4,716    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     127    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     3,046    
Building and Improvements     4,767    
Total $ 7,813   7,813    
Accumulated Depreciation     687    
Date Acquired Apr. 12, 2016        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 7,813        
Litchfield Market Village | Litchfield I, Litchfield II, Litchfield Market Village          
Gross Amount at which Carried at End of Period          
Mortgage note     7,500    
Litchfield Market Village | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Litchfield Market Village | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Moncks Corner          
Initial Cost          
Land     0    
Building and Improvements     1,109    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     9    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     0    
Building and Improvements     1,118    
Total $ 1,118   1,118    
Accumulated Depreciation     162    
Date Acquired Apr. 12, 2016        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 1,118        
Moncks Corner | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Moncks Corner | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Ridgeland          
Initial Cost          
Land     203    
Building and Improvements     376    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     0    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     203    
Building and Improvements     376    
Total $ 579   579    
Accumulated Depreciation     65    
Date Acquired Apr. 12, 2016        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 579        
Ridgeland | Georgetown Ridgeland Lagrange          
Gross Amount at which Carried at End of Period          
Mortgage note     5,600    
Ridgeland | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Ridgeland | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Shoppes at Myrtle Park          
Initial Cost          
Land     3,182    
Building and Improvements     5,360    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     824    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     3,182    
Building and Improvements     6,184    
Total $ 9,366   9,366    
Encumbrances     5,892    
Accumulated Depreciation     921    
Date Acquired Apr. 12, 2016        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 9,366        
Shoppes at Myrtle Park | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Shoppes at Myrtle Park | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
South Lake          
Initial Cost          
Land     804    
Building and Improvements     2,025    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     (27)    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     804    
Building and Improvements     1,998    
Total $ 2,802   2,802    
Accumulated Depreciation     261    
Date Acquired Apr. 12, 2016        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 2,802        
South Lake | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
South Lake | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
South Park          
Initial Cost          
Land     943    
Building and Improvements     2,967    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     98    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     1,019    
Building and Improvements     2,989    
Total $ 4,008   4,008    
Accumulated Depreciation     393    
Date Acquired Apr. 12, 2016        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 4,008        
South Park | Ladson Crossing, Lake Greenwood and South Park          
Gross Amount at which Carried at End of Period          
Mortgage note     7,400    
South Park | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
South Park | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Berkley          
Initial Cost          
Land     1,005    
Building and Improvements     2,865    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     (50)    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     1,005    
Building and Improvements     2,815    
Total $ 3,820   3,820    
Accumulated Depreciation     335    
Date Acquired Nov. 10, 2016        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 3,820        
Berkley | Mortgages | Berkley/Sangaree/Tri-County          
Gross Amount at which Carried at End of Period          
Mortgage note     9,400    
Berkley | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Berkley | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Sangaree          
Initial Cost          
Land     2,302    
Building and Improvements     2,922    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     636    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     2,503    
Building and Improvements     3,357    
Total $ 5,860   5,860    
Accumulated Depreciation     655    
Date Acquired Nov. 10, 2016        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 5,860        
Sangaree | Mortgages | Berkley/Sangaree/Tri-County          
Gross Amount at which Carried at End of Period          
Mortgage note     9,400    
Sangaree | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Sangaree | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Tri-county          
Initial Cost          
Land     411    
Building and Improvements     3,421    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     376    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     635    
Building and Improvements     3,573    
Total $ 4,208   4,208    
Accumulated Depreciation     552    
Date Acquired Nov. 10, 2016        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 4,208        
Tri-county | Mortgages | Berkley/Sangaree/Tri-County          
Gross Amount at which Carried at End of Period          
Mortgage note     9,400    
Tri-county | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Tri-county | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Riverbridge          
Initial Cost          
Land     774    
Building and Improvements     5,384    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     0    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     774    
Building and Improvements     5,384    
Total $ 6,158   6,158    
Encumbrances     4,000    
Accumulated Depreciation     727    
Date Acquired Nov. 15, 2016        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 6,158        
Riverbridge | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Riverbridge | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Laburnum Square          
Initial Cost          
Land     3,736    
Building and Improvements     5,928    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     215    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     3,811    
Building and Improvements     6,068    
Total $ 9,879   9,879    
Encumbrances     7,665    
Accumulated Depreciation     798    
Date Acquired Dec. 07, 2016        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 9,879        
Laburnum Square | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Laburnum Square | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Franklin Village          
Initial Cost          
Land     2,608    
Building and Improvements     9,426    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     26    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     2,608    
Building and Improvements     9,452    
Total $ 12,060   12,060    
Encumbrances     8,404    
Accumulated Depreciation     1,078    
Date Acquired Dec. 12, 2016        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 12,060        
Franklin Village | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Franklin Village | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Village at Martinsville          
Initial Cost          
Land     5,208    
Building and Improvements     12,879    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     241    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     5,228    
Building and Improvements     13,100    
Total $ 18,328   18,328    
Encumbrances     15,979    
Accumulated Depreciation     1,772    
Date Acquired Dec. 16, 2016        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 18,328        
Village at Martinsville | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Village at Martinsville | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
New Market          
Initial Cost          
Land     993    
Building and Improvements     5,216    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     363    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     1,042    
Building and Improvements     5,530    
Total $ 6,572   6,572    
Encumbrances     6,508    
Accumulated Depreciation     690    
Date Acquired Dec. 20, 2016        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 6,572        
New Market | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
New Market | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
Rivergate Shopping Center          
Initial Cost          
Land     1,570    
Building and Improvements     30,694    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     146    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     1,672    
Building and Improvements     30,738    
Total $ 32,410   32,410    
Encumbrances     21,164    
Accumulated Depreciation     3,596    
Date Acquired Dec. 21, 2016        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 32,410        
Rivergate Shopping Center | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
Rivergate Shopping Center | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years        
JANAF          
Initial Cost          
Land     8,267    
Building and Improvements     66,549    
Costs Capitalized Subsequent to Acquisition          
Improvements (net)     441    
Carrying Costs     0    
Gross Amount at which Carried at End of Period          
Land     8,467    
Building and Improvements     66,790    
Total $ 75,257   75,257    
Encumbrances     59,982    
Accumulated Depreciation     $ 5,912    
Date Acquired Jan. 18, 2018        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]          
Balance at end of period $ 75,257        
JANAF | Minimum          
Gross Amount at which Carried at End of Period          
Depreciation Life 5 years        
JANAF | Maximum          
Gross Amount at which Carried at End of Period          
Depreciation Life 40 years