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Note 12 - Segments - Assets by Reportable Segment (Details) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Land, buildings and improvements, net $ 138,064,936 $ 166,253,967
Total assets 161,196,763 185,568,616
Cash, cash equivalents and restricted cash 14,702,089 11,540,917
Other assets, net 4,658,504 3,422,781
Operating Segments [Member]    
Total assets 135,080,107 168,400,913
Segment Reconciling Items [Member]    
Total assets 161,196,763 185,568,616
Cash, cash equivalents and restricted cash 6,738,345 2,149,088
Other assets, net 19,378,311 15,018,615
Office/Industrial Properties [Member] | Operating Segments [Member]    
Land, buildings and improvements, net [1] 78,240,086 99,120,649
Total assets [2] 76,453,436 100,046,782
Model Home Properties [Member] | Operating Segments [Member]    
Land, buildings and improvements, net [1] 34,089,046 42,509,596
Total assets [2] 31,047,202 42,246,022
Retail Properties [Member] | Operating Segments [Member]    
Land, buildings and improvements, net [1] 25,693,239 24,555,371
Total assets [2] $ 27,579,469 $ 26,108,109
[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.