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Note 3 - Restricted Cash - Schedule of Restricted Cash and Cash Equivalents (Details) - USD ($)
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Restricted cash $ 381,113 $ 343,518    
Cash and cash equivalents 42,270,664 16,028,514    
Total Cash, Cash Equivalents, and Restricted Cash as Presented in the Consolidated Statement of Cash Flows 42,651,777 16,372,032 $ 10,028,211 $ 18,143,839
Insurance Premium Escrow [Member]        
Restricted cash $ 381,113 $ 343,518