Note 8 - Regulatory Capital Requirements (Details)	3 Months Ended
	Mar. 31, 2016
Disclosure Text Block [Abstract]
Annual Phase-in Percentage of Capital Conservation Buffer	0.625%
Capital Required For Capital Adequacy To Risk Weighted Assets With Capital Conservation Buffer Fully Phased In	10.50%
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets With Capital Conservation Buffer Fully Phased in	8.50%
Common Equity Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets With Capital Conservation Buffer Fully Phased in	7.00%