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Note 12 - Segments - Assets by Reportable Segment (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Total assets $ 159,142,006 $ 185,568,616
Cash, cash equivalents and restricted cash 6,985,381 11,540,917
Other assets, net 2,846,561 3,422,781
Operating Segments [Member]    
Total assets 144,039,567 168,400,913
Segment Reconciling Items [Member]    
Total assets 159,142,006 185,568,616
Cash, cash equivalents and restricted cash 229,700 2,149,088
Other assets, net 14,872,739 15,018,615
Office/Industrial Properties [Member] | Operating Segments [Member]    
Land, buildings and improvements, net [1] 86,427,084 99,120,649
Total assets [2] 85,861,760 100,046,782
Model Home Properties [Member] | Operating Segments [Member]    
Land, buildings and improvements, net [1] 37,888,865 42,509,596
Total assets [2] 35,987,702 42,246,022
Retail Properties [Member] | Operating Segments [Member]    
Land, buildings and improvements, net [1] 20,970,712 24,555,371
Total assets [2] $ 22,190,105 $ 26,108,109
[1] Includes lease intangibles and the land purchase option related to property acquisitions.
[2] Includes land, buildings and improvements, cash, cash equivalents, and restricted cash, current receivables, deferred rent receivables and deferred leasing costs and other related intangible assets, all shown on a net basis.