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Note 7 - Mortgage Notes Payable - Scheduled Principal Payments of Mortgage Notes Payable (Details) - USD ($)
Jun. 30, 2020
Dec. 31, 2019
Long-Term Debt, Maturity, Remainder of Fiscal Year $ 7,032,975  
Long-Term Debt, Maturity, Year One 29,091,117 $ 29,166,847
2022 18,303,975 16,892,476
2023 5,419,196 18,472,632
2024 1,645,496 1,783,291
Thereafter 64,949,341  
Total 126,442,100 143,459,048
Office/Industrial and Retail Notes Payable [Member]    
Long-Term Debt, Maturity, Remainder of Fiscal Year 882,006  
Long-Term Debt, Maturity, Year One 16,382,167 16,871,952
2022 9,798,450 4,960,217
2023 1,514,611 10,055,657
2024 1,645,496 1,783,291
Thereafter 64,949,341  
Total 95,172,071 110,814,919
Model Home Properies Notes Payable [Member]    
Long-Term Debt, Maturity, Remainder of Fiscal Year 6,150,969  
Long-Term Debt, Maturity, Year One 12,708,950 12,294,895
2022 8,505,525 11,932,259
2023 3,904,585 8,416,975
2024
Thereafter  
Total $ 31,270,029 $ 32,644,129