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Note 8 - Revenue From Contracts With Customers (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Revenue from Contract with Customer, Excluding Assessed Tax $ 830,000 $ 826,000 $ 1,646,000 $ 1,607,000
Credit and Debit Card [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax $ 356,000 $ 375,000 $ 690,000 $ 735,000