Note 15 - Regulatory Capital Ratios (Details Textual)		12 Months Ended
		Mar. 31, 2016	Jan. 01, 2019	Jan. 01, 2016	Mar. 31, 2015
Scenario, Forecast [Member]
Capital Conservation Buffer Level R Ratio			2.50%
Common Equity Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	[1]	6.50%			6.50%
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	[1]	8.00%			8.00%
Capital Required to be Well Capitalized to Risk Weighted Assets	[1]	10.00%			10.00%
Tier One Leverage Capital Required to be Well Capitalized to Average Assets	[1]	5.00%			5.00%
Capital Conservation Buffer Level R Ratio				0.625%
Capital Conservation Buffer Phase In Period		4 years

[1] Under prompt corrective action