Note 9 - Qualified Affordable Housing Partnership Investments (Details) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Mar. 31, 2016		Mar. 31, 2015	Dec. 31, 2015
Note 9 - Qualified Affordable Housing Partnership Investments (Details) [Line Items]
Proportional Amortization Method Qualified Affordable Housing Project Investments	$ 4,634			$ 4,815
Proportional Amortization Method Qualified Affordable Housing Project Investments, Unfunded Liability Obligation	$ 1,004			1,182
Qualified Affordable Housing Project Investments Term	18 years
Proportional Amortization Method Qualified Affordable Housing Project Investments, Amortization	$ 180	[1]	$ 178	$ 714	[1]
Minimum [Member]
Note 9 - Qualified Affordable Housing Partnership Investments (Details) [Line Items]
Qualified Affordable Housing Project Investments, Return Rate	4.00%
Maximum [Member]
Note 9 - Qualified Affordable Housing Partnership Investments (Details) [Line Items]
Qualified Affordable Housing Project Investments, Return Rate	7.00%

[1] This amount reduces the tax credits and benefits generated by the Qualified Affordable Housing partnerships.