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Note 3 - Restricted Cash - Schedule of Restricted Cash and Cash Equivalents (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Restricted cash $ 343,518 $ 1,038,767  
Cash and cash equivalents 16,028,514 17,105,072  
Total Cash, Cash Equivalents, and Restricted Cash as Presented in the Consolidated Statements of Cash Flows 16,372,032 18,143,839 $ 7,230,570
Insurance Premium Escrow [Member]      
Restricted cash $ 343,518 $ 1,038,767