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Note 8 - Intangible Assets - Estimated Future Amortization Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
2022 $ 705  
2023 648  
2024 613  
2025 543  
2026 441  
Thereafter 340  
Finite-Lived Intangible Assets, Net, Ending Balance 3,290  
Mortgage Servicing Rights [Member]    
2022 695  
2023 648  
2024 613  
2025 543  
2026 441  
Thereafter 340  
Finite-Lived Intangible Assets, Net, Ending Balance 3,280 $ 3,043
Core Deposits [Member]    
2022 10  
2023 0  
2024 0  
2025 0  
2026 0  
Thereafter 0  
Finite-Lived Intangible Assets, Net, Ending Balance $ 10 $ 57