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Note 6 - Investment Securities (Details Textual)
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
security
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
security
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Investment Securities [Line Items]          
Proceeds from sale of investment securities $ 9,511,000 $ 0 $ 30,294,000 $ 4,159,000  
Available-for-sale securities pledged as collateral $ 202,638,000   $ 202,638,000   $ 194,573,000
Debt Securities, Available-for-sale, Restriction Type [Extensible List] us-gaap:CollateralPledgedMember   us-gaap:CollateralPledgedMember   us-gaap:CollateralPledgedMember
Investment equity securities $ 5,850,000   $ 5,850,000   $ 9,421,000
Proceeds from the sale of equity securities 6,404,000 1,330,000 10,924,000 2,720,000  
Debt Securities [Member]          
Investment Securities [Line Items]          
Income tax expense (benefit) related to net realized gains (losses) on sales of securities $ 0 0 (8,000) 1,000  
Other than temporary impairment, credit losses recognized in earnings     $ 0 0  
PreTSL [Member]          
Investment Securities [Line Items]          
Number of trust preferred securities | security 1   1    
Available-for-sale, amortized cost $ 86,000   $ 86,000    
Fair value 78,000   78,000    
Equity Securities [Member]          
Investment Securities [Line Items]          
Income tax expense (benefit) related to net recognized gains (losses) on sales of securities $ 192,000 $ 263,000 $ 539,000 $ 242,000