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Note 8 - Revenue From Contracts With Customers (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Revenue from Contract with Customer, Excluding Assessed Tax $ 836,000 $ 829,000 $ 2,482,000 $ 2,436,000
Credit and Debit Card [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax $ 332,000 $ 351,000 $ 1,000,000.0 $ 1,100,000