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Note 3 - Restricted Cash - Schedule of Restricted Cash and Cash Equivalents (Details) - USD ($)
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Restricted cash $ 405,335   $ 771,549  
Cash and cash equivalents 9,622,876 $ 17,105,072 4,817,750  
Total Cash, Cash Equivalents, and Restricted Cash as Presented in the Consolidated Statement of Cash Flows 10,028,211 18,143,839 $ 5,589,299 $ 7,230,570
Insurance Premium Escrow [Member]        
Restricted cash $ 405,335 $ 1,038,767