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Note 12 - Segments - Operating Income by Segment (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Rental, fees and other income | $ 6,121,404 |  | $ 7,120,987 |  | $ 13,150,555 | $ 14,300,251 | $ 28,641,111 | $ 32,344,013
Property and related expenses | (1,999,834) |  | (2,526,002) |  | (4,380,926) | (5,289,552) | (10,410,574) | (10,886,719)
General and administrative expenses | (1,278,971) |  | (1,419,668) |  | (2,630,316) | (3,180,371) | (5,268,315) | (4,532,703)
Depreciation and amortization | (1,622,230) |  | (1,749,113) |  | (3,196,756) | (3,959,194) | (7,364,688) | (9,101,605)
Interest expense | (2,273,355) |  | (2,491,870) |  | (4,827,202) | (5,037,073) | (10,649,646) | (13,041,016)
Other income (expense), net | 8,400 |  | 4,409 |  | 1,405 | 9,933 |  |
Income tax expense | (51,369) |  | (191,809) |  | (135,000) | (273,239) | (611,263) | (518,567)
Gain on sale of real estate | 334,096 |  | 176,392 |  | 324,261 | 1,390,634 | 6,319,272 | 12,200,138
Net loss | (1,607,534) | $ (932,119) | (1,076,674) | $ (961,937) | (2,539,653) | (2,038,611) | 772,934 | 4,452,723
Operating Segments [Member] |  |  |  |  |  |  |  |
Net operating income, as defined | 3,275,895 |  | 4,594,985 |  | 7,923,955 | 9,010,699 | 18,230,537 | 21,457,294
Office/Industrial Properties [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |
Rental, fees and other income | 4,198,849 |  | 5,496,096 |  | 9,183,790 | 10,950,249 | 21,490,215 | 24,037,363
Property and related expenses | (1,657,836) |  | (2,299,126) |  | (3,673,459) | (4,803,914) | (9,317,720) | (9,494,885)
Net operating income, as defined | 2,541,013 |  | 3,196,970 |  | 5,510,331 | 6,146,335 | 12,172,495 | 14,542,478
Model Home Properties [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |
Rental, fees and other income | 1,093,015 |  | 1,001,918 |  | 2,209,745 | 2,083,602 | 4,194,489 | 4,642,159
Property and related expenses | (55,531) |  | (48,187) |  | (101,791) | (98,609) | (193,367) | (174,238)
Net operating income, as defined | 1,037,484 |  | 953,731 |  | 2,107,954 | 1,984,993 | 4,001,122 | 4,467,921
Retail Properties [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |
Rental, fees and other income | 829,540 |  | 622,973 |  | 1,757,020 | 1,266,400 | 2,956,407 | 3,664,491
Property and related expenses | (1,132,142) |  | (178,689) |  | (1,451,350) | (387,029) | (899,487) | (1,217,596)
Net operating income, as defined | $ (302,602) |  | $ 444,284 |  | $ 305,670 | $ 879,371 | $ 2,056,920 | $ 2,446,895

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