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Note 13 - Regulatory Capital (Details Textual) - USD ($)
$ in Millions
Jan. 01, 2019
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Amount Available for Dividend Distribution without Affecting Capital Adequacy Requirements   $ 23.9    
Common Equity Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets   4.50% 4.50%  
Common Equity Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets    
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets   6.00% 6.00%  
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets    
Capital Required for Capital Adequacy to Risk Weighted Assets   8.00% 8.00%  
Capital Required to be Well Capitalized to Risk Weighted Assets    
Capital Conservation Buffer   2.50%    
Scenario, Forecast [Member]        
Common Equity Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets 7.00%      
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets 8.50%      
Capital Required for Capital Adequacy to Risk Weighted Assets 10.50%      
Subsidiaries [Member]        
Common Equity Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets   4.50% 4.50%  
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 for Capital Adequacy to Risk Weighted Assets   6.00% 6.00% 4.00%
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets   8.00% 8.00% 6.00%
Capital Required for Capital Adequacy to Risk Weighted Assets   8.00% 8.00% 8.00%
Capital Required to be Well Capitalized to Risk Weighted Assets   10.00% 10.00%