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Note 9 - Revenue From Contracts With Customers (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Revenue from Contract with Customer, Excluding Assessed Tax, Total $ 738,000 $ 887,000
Other Real Estate, Disposals 0  
Credit and Debit Card [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax, Total $ 381,000 $ 351,000