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Note 15 - Fair Value Measurements and Fair Values of Financial Instruments (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenue from Contract with Customer, Including Assessed Tax $ 7,755,000 $ 5,650,000 $ 4,081,000
Servicing Asset, Total 201,700,000 204,400,000  
Interest and Fee Income, Loans Held-for-sale, Mortgages $ 500,000 $ 1,200,000  
SBA Servicing Assets [Member]      
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 10 Percent Adverse Change in Key Assumptions, Percent 10.00% 10.00%  
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 20 Percent Adverse Change in Key Assumptions 20.00% 20.00%  
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]      
Mortgages Held-for-sale, Fair Value Disclosure $ 0 $ 0  
Shareholder Service [Member]      
Revenue from Contract with Customer, Including Assessed Tax $ 1,900,000 $ 2,000,000 $ 1,800,000