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Note 13 - Segments - Assets by Reportable Segment (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Land, buildings and improvements, net $ 166,253,967 $ 200,206,620
Total assets 185,568,616 220,784,408
Cash, cash equivalents and restricted cash 11,540,917 10,391,275
Other assets, net 3,422,781 5,709,586
Operating Segments [Member]    
Total assets 168,400,913 209,158,266
Segment Reconciling Items [Member]    
Total assets 185,568,616 220,784,408
Cash, cash equivalents and restricted cash 2,149,088 1,591,041
Other assets, net 15,018,615 10,035,101
Office/Industrial Properties [Member] | Operating Segments [Member]    
Land, buildings and improvements, net [1] 99,120,649 126,421,648
Total assets [2] 100,046,782 131,180,612
Model Home Properties [Member] | Operating Segments [Member]    
Land, buildings and improvements, net [1] 42,509,596 48,466,371
Total assets [2] 42,246,022 51,389,400
Retail Properties [Member] | Operating Segments [Member]    
Land, buildings and improvements, net [1] 24,555,371 25,318,601
Total assets [2] $ 26,108,109 $ 26,588,254
[1] Includes lease intangibles and the land purchase option related to property acquisitions.
[2] Includes land, buildings and improvements, current receivables, deferred rent receivables and deferred leasing costs and other related intangible assets, all shown on a net basis.