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Note 7 - Goodwill and Other Intangibles - Core Deposit Intangibles (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2015
Core deposit intangible acquired in Peoples acquisition     $ 1,400,000
Total $ 966,000 $ 1,112,000  
Core Deposits [Member]      
Core deposit intangible acquired in Peoples acquisition 1,418,000 1,418,000  
Less accumulated amortization 452,000 306,000  
Total $ 966,000 $ 1,112,000