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Note 15 - Regulatory Capital Requirements (Details)
Dec. 31, 2015
Dec. 31, 2014
Disclosure Text Block [Abstract]    
Capital Conservation Buffer 2.50%  
Capital Conservation Buffer, Annual Phase-in 0.625%  
Common Equity Tier 1 Capital Required For Capital Adequacy to Risk Weighted Assets 4.50%  
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets 6.00% 4.00%
Capital Required for Capital Adequacy to Risk Weighted Assets 8.00% 8.00%
Tier One Leverage Capital Required for Capital Adequacy to Average Assets 4.00% 4.00%