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Note 4 - Summary of Significant Accounting Policies - Restricted Cash (Details) - USD ($)
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Cash on consolidated balance sheet $ 606,672 $ 486,604    
Restricted cash 654,897 629,651    
Total cash and restricted cash $ 1,261,569 $ 1,116,255 $ 1,131,743 $ 2,249,551