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Note 8 - Revenue From Contracts With Customers (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Revenue from Contract with Customer, Excluding Assessed Tax $ 829,000 $ 814,000     $ 2,436,000 $ 2,352,000
Credit and Debit Card [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax $ 351,000 $ 409,000 $ 1,100,000 $ 1,200,000