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Note 13 - Segments - Operating Income by Segment (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Rental, fees and other income $ 24,351,792 $ 28,641,111
Property and related expenses (8,818,283) (10,410,574)
General and administrative expenses (5,751,754) (5,268,315)
Depreciation and amortization (6,274,321) (7,364,688)
Interest expense (8,813,067) (10,649,646)
Deferred offering costs (530,639) 0
Other income (expense), net (20,636) 117,037
Income tax expense (370,884) (611,263)
Gain on sale of real estate 1,245,460 6,319,272
Net loss (6,261,398) 772,934
Operating Segments [Member]    
Net operating income, as defined 14,254,443 18,230,537
Office/Industrial Properties [Member] | Operating Segments [Member]    
Rental, fees and other income 17,580,472 21,490,215
Property and related expenses (7,977,561) (9,317,720)
Net operating income, as defined 9,602,911 12,172,495
Model Home Properties [Member] | Operating Segments [Member]    
Rental, fees and other income 4,251,980 4,194,489
Property and related expenses (202,667) (193,367)
Net operating income, as defined 4,049,313 4,001,122
Retail Properties [Member] | Operating Segments [Member]    
Rental, fees and other income 2,971,125 2,956,407
Property and related expenses (2,368,906) (899,487)
Net operating income, as defined $ 602,219 $ 2,056,920