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Note 12 - Segments - Operating Income by Segment (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Rental, fees and other income | $ 5,663,568 |  |  | $ 7,000,870 |  |  | $ 18,814,123 | $ 21,301,121
Property and related expenses | (2,108,621) |  |  | (2,533,064) |  |  | (6,489,547) | (7,822,616)
General and administrative expenses | (1,366,380) |  |  | (1,451,873) |  |  | (3,996,696) | (4,632,244)
Depreciation and amortization | (1,626,917) |  |  | (1,755,253) |  |  | (4,823,673) | (5,714,446)
Interest expense | (2,143,960) |  |  | (2,830,858) |  |  | (6,971,162) | (7,867,932)
Other income (expense), net | (12,270) |  |  | 9,294 |  |  | (10,865) | 19,227
Income tax expense | (122,602) |  |  | (338,713) |  |  | (257,602) | (611,952)
Gain on sale of real estate | 332,715 |  |  | 4,853,186 |  |  | 656,975 | 6,243,819
Net (loss) income | (1,384,468) | $ (1,607,534) | $ (932,119) | 2,953,589 | $ (1,076,674) | $ (961,937) | (3,924,121) | 914,977
Operating Segments [Member] |  |  |  |  |  |  |  |
Net operating income, as defined | 3,554,946 |  |  | 4,467,806 |  |  | 11,478,902 | 13,478,505
Office/Industrial Properties [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |
Rental, fees and other income | 4,098,892 |  |  | 5,137,114 |  |  | 13,334,595 | 16,087,363
Property and related expenses | (1,813,950) |  |  | (2,237,392) |  |  | (5,539,320) | (7,041,306)
Net operating income, as defined | 2,284,942 |  |  | 2,899,722 |  |  | 7,795,275 | 9,046,057
Model Home Properties [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |
Rental, fees and other income | 1,058,329 |  |  | 1,083,470 |  |  | 3,268,074 | 3,167,072
Property and related expenses | (58,897) |  |  | (42,258) |  |  | (160,688) | (140,866)
Net operating income, as defined | 999,432 |  |  | 1,041,212 |  |  | 3,107,386 | 3,026,206
Retail Properties [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |
Rental, fees and other income | 548,392 |  |  | 780,286 |  |  | 2,305,412 | 2,046,686
Property and related expenses | (277,820) |  |  | (253,414) |  |  | (1,729,171) | (640,444)
Net operating income, as defined | $ 270,572 |  |  | $ 526,872 |  |  | $ 576,241 | $ 1,406,242

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