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Note 10 - Intangible Assets - Estimated Future Amortization Expense (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
2020 $ 464  
2021 524  
2022 434  
2023 356  
2024 278  
Thereafter 281  
Total 2,337  
Mortgage Servicing Rights [Member]    
2020 390  
2021 477  
2022 424  
2023 356  
2024 278  
Thereafter 281  
Total 2,206 $ 2,172
Core Deposits [Member]    
2020 74  
2021 47  
2022 10  
2023 0  
2024 0  
Thereafter 0  
Total $ 131 $ 156