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Note 9 - Revenue From Contracts With Customers (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Revenue from Contract with Customer, Excluding Assessed Tax, Total $ 814,000 $ 833,000 $ 2,352,000 $ 2,456,000
Credit and Debit Card [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax, Total $ 409,000 $ 394,000 $ 1,200,000 $ 1,100,000