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Note 12 - Shareholders' Equity (Details Textual) - USD ($)
12 Months Ended
Nov. 15, 2019
May 15, 2019
Nov. 15, 2018
May 15, 2018
Nov. 15, 2017
May 15, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments without Regulatory Approval             $ 30,278,000    
Common Stock, Dividends, Per Share, Cash Paid $ 0.23 $ 0.23 $ 0.18 $ 0.18 $ 0.14 $ 0.14      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount             0 71,100 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross             132,000 76,000 0
Share-based Payment Arrangement, Expense             $ 224,000 $ 199,000 $ 152,000
Share-based Payment Arrangement, Expense, Tax Benefit             16,000 14,000 11,000
Proceeds from Stock Options Exercised             144,000 330,000 261,000
Share-based Payment Arrangement, Exercise of Option, Tax Benefit             $ 41,000 $ 134,000 $ 112,000
Common Equity Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets [1]             4.50% 4.50%  
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets [1]             6.00% 6.00%  
Capital Required for Capital Adequacy to Risk Weighted Assets [1]             8.00% 8.00%  
Tier One Leverage Capital Required for Capital Adequacy to Average Assets [1]             4.00% 4.00%  
Common Equity Tier One Risk Based Capital Required to Be Well Capitalized to Risk Weighted Assets             6.50% 6.50%  
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets             8.00% 8.00%  
Capital Required to be Well Capitalized to Risk Weighted Assets             10.00% 10.00%  
Tier One Leverage Capital Required to be Well Capitalized to Average Assets             5.00% 5.00%  
Capital Conservation Buffer             2.50%    
Asset Threshold to Qualify for the Policy Statement after Adopted Final Amendments to the Small Bank Holding Company Policy Statment             $ 3,000,000,000    
Stock Option Plan 2001 [Member]                  
Common Stock, Capital Shares Reserved for Future Issuance             0    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant             0    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total             $ 0    
Stock Option Plan 2013 [Member]                  
Common Stock, Capital Shares Reserved for Future Issuance             408,855    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant             106,500    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total             $ 811,000    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period             10 years    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross             132,000 76,000 0
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition             3 years 146 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value             $ 197,000 $ 150,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value             $ 545,000 $ 1,504,000  
[1] Does not include amounts required under the capital conservation buffer discussed above.