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Note 3 - Summary of Significant Accounting Policies - Restricted Cash (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash on consolidated balance sheet $ 486,604 $ 1,645,481  
Restricted cash 629,651 604,070  
Total cash and restricted cash $ 1,116,255 $ 2,249,551 $ 11,733,271