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Note 8 - Revenue From Contracts With Customers (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Revenue from Contract with Customer, Excluding Assessed Tax $ 826,000 $ 800,000 $ 1,607,000 $ 1,538,000
Credit and Debit Card [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax $ 375,000 $ 435,000 $ 735,000 $ 816,000