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Note 10 - Intangible Assets - Estimated Future Amortization Expense (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
2020 $ 181  
2021 643  
2022 560  
2023 495  
2024 437  
Thereafter 646  
Total 2,962  
Mortgage Servicing Rights [Member]    
2020 156  
2021 596  
2022 550  
2023 495  
2024 437  
Thereafter 646  
Total 2,880 $ 2,172
Core Deposits [Member]    
2020 25  
2021 47  
2022 10  
2023 0  
2024 0  
Thereafter 0  
Total $ 82 $ 156