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Note 12 - Segments - Assets by Reportable Segment (Details) - USD ($) | Jun. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Land, buildings and improvements, net |  |  | $ 200,206,620 |  | $ 211,108,065 |
Total assets | $ 194,221,128 |  | 220,784,408 |  | 233,050,040 |
Cash, cash equivalents and restricted cash | 8,657,989 |  | 10,391,275 |  | 9,776,215 |
Other assets, net | 4,949,592 |  | 5,709,586 |  | 7,646,207 |
Operating Segments [Member] |  |  |  |  |  |
Total assets | 180,799,283 |  | 209,158,266 |  | 220,186,759 |
Segment Reconciling Items [Member] |  |  |  |  |  |
Total assets | 194,221,128 |  | 220,784,408 |  | 233,050,040 |
Cash, cash equivalents and restricted cash | 2,023,182 |  | 1,591,041 |  | 9,776,215 |
Other assets, net | 11,398,663 |  | 10,035,101 |  | 3,087,066 |
Office/Industrial Properties [Member] | Operating Segments [Member] |  |  |  |  |  |
Land, buildings and improvements, net | 103,838,473 | [1] | 126,421,648 | [1],[2] | 138,694,773 | [2]
Total assets | 103,584,934 | [3] | 131,180,612 | [3],[4] | 143,620,315 | [4]
Model Home Properties [Member] | Operating Segments [Member] |  |  |  |  |  |
Land, buildings and improvements, net | 47,369,007 | [1] | 48,466,371 | [1],[2] | 48,762,869 | [2]
Total assets | 50,721,230 | [3] | 51,389,400 | [3],[4] | 48,864,060 | [4]
Retail Properties [Member] | Operating Segments [Member] |  |  |  |  |  |
Land, buildings and improvements, net | 25,226,109 | [1] | 25,318,601 | [1],[2] | 23,650,423 | [2]
Total assets | $ 26,493,119 | [3] | $ 26,588,254 | [3],[4] | $ 27,702,384 | [4]
[1] | Includes lease intangibles and the land purchase option related to property acquisitions.
[2] | Includes lease intangibles and the land purchase option related to property acquisitions.
[3] | 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.
[4] | 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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