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Note 4 - Accounts Receivable - Schedule of Receivables (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Allowance for doubtful accounts $ (81,778) $ (50,565)
Accounts receivable, net 4,507,924 4,464,444
Trade Accounts Receivable [Member]    
Accounts receivable, gross 3,926,977 3,621,695
Premium [Member]    
Accounts receivable, gross 662,725 890,974
Anticipated Salvage and Subrogation [Member]    
Accounts receivable, gross $ 2,340