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Note 13 - Segments - Assets by Reportable Segment (Details) - USD ($)
Dec. 31, 2024
Dec. 31, 2023
Land, buildings and improvements, net $ 127,596,500 $ 144,155,784
Total assets 142,569,650 175,962,638
Cash, cash equivalents and restricted cash 8,036,496 6,510,428
Other assets, net 14,973,150 31,806,854
Operating Segments [Member]    
Total assets 131,133,231 146,136,063
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member]    
Cash, cash equivalents and restricted cash 564,922 277,143
Other assets, net 10,871,497 29,549,432
Office/Industrial Properties [Member] | Operating Segments [Member]    
Land, buildings and improvements, net [1] 74,425,180 77,472,724
Total assets [2] 76,292,662 78,140,372
Model Home Properties [Member] | Operating Segments [Member]    
Land, buildings and improvements, net [1] 37,416,000 50,790,147
Total assets [2] 38,166,964 51,456,292
Retail Properties [Member] | Operating Segments [Member]    
Land, buildings and improvements, net [1] 15,743,789 15,877,190
Total assets [2] $ 16,673,605 $ 16,539,399
[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.