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Note 3 - Restricted Cash - Schedule of Restricted Cash and Cash Equivalents (Details) - USD ($)
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Restricted cash $ 483,150 $ 343,518    
Cash and cash equivalents 51,606,579 16,028,514    
Total Cash, Cash Equivalents, and Restricted Cash as Presented in the Consolidated Statement of Cash Flows 52,089,729 16,372,032 $ 10,849,713 $ 18,143,839
Insurance Premium Escrow [Member]        
Restricted cash $ 483,150 $ 343,518