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Note 6 - Other Assets - Other Assets 1 (Details) - USD ($)
Jun. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Raw land $ 26,666,657 $ 27,407,677 $ 26,816,105
Right of use asset, net   661,000  
Total other assets 4,949,592 5,709,586 7,646,207
Other Assets [Member]      
Deferred rent receivable 2,127,276 2,680,886 2,883,581
Prepaid expenses, deposits and other 492,775 601,897 407,106
Accounts receivable, net 1,353,841 1,336,122 2,845,314
Raw land   900,000
Right of use asset, net 115,434 561,375
Other intangibles, net 172,483 212,932 293,832
Notes receivable 316,374 316,374 $ 316,374
Total other assets $ 4,949,592 $ 5,709,586