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Note 4 - Accounts Receivable - Schedule of Receivables (Details) - USD ($)
Jun. 30, 2020
Dec. 31, 2019
Allowance for doubtful accounts $ (150,181) $ (127,635)
Accounts receivable, net 4,105,785 4,190,543
Trade Accounts Receivable [Member]    
Accounts receivable, gross 3,368,453 3,346,215
Premium [Member]    
Accounts receivable, gross $ 887,513 $ 971,963