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Note 5 - Accounts Receivable (Details Textual) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Accounts Receivable, after Allowance for Credit Loss, Current, Total $ 6,560,928 $ 6,290,412
Accounts Receivable, Allowance for Credit Loss, Current 214,000 214,000
North American Credit Card Processing [Member]    
Accounts Receivable, after Allowance for Credit Loss, Current, Total 68,000 74,000
Non-US [Member]    
Accounts Receivable, after Allowance for Credit Loss, Current, Total $ 6,200,000 $ 6,200,000