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Note 20 - Business Acquisition - Schedule of Future Amortization Expenses for Core Deposits Intangibles (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
2023 $ 296  
Total 2,397 $ 2,749
Core Deposits [Member]    
2019 341  
2020 332  
2021 321  
2022 309  
Thereafter 798  
Merger of Liberty Bank, N.A. into The Middlefield Banking Company [Member] | Core Deposits [Member]    
2019 341  
2020 332  
2021 321  
2022 309  
2023 296  
Thereafter 798  
Total $ 2,397