Note 9 - Qualified Affordable Housing Partnership Investments (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended			12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016		Jun. 30, 2015	Dec. 31, 2015
Minimum [Member]
Qualified Affordable Housing Project Investments Return Rate			4.00%
Maximum [Member]
Qualified Affordable Housing Project Investments Return Rate			7.00%
Proportional Amortization Method Qualified Affordable Housing Project Investments	$ 4,455		$ 4,455			$ 4,815
Proportional Amortization Method Qualified Affordable Housing Project Investments Unfunded Liability Obligation	523		$ 523			1,182
Qualified Affordable Housing Project Investments Term			18 years
Proportional Amortization Method Qualified Affordable Housing Project Investments Amortization	$ 180	$ 184	$ 360	[1]	$ 361	$ 714	[1]

[1] This amount reduces the tax credits and benefits.