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Note 6 - Other Assets - Other Assets (Details) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Investment in marketable securities $ 1,600,000 $ 83,000
Total other assets 4,449,538 3,422,781
Other Assets [Member]    
Deferred rent receivable 1,644,276 1,912,048
Prepaid expenses, deposits and other 273,585 215,946
Investment in marketable securities 1,670,693 83,241
Accounts receivable, net 363,104 541,885
Right-of-use assets, net 81,637 102,144
Other intangibles, net 97,483 142,483
Notes receivable 316,374 316,374
Deferred offering costs 2,386 108,660
Total other assets $ 4,449,538 $ 3,422,781