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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.

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