Note 24 - Qualified Affordable Housing Partnership Investments (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Proportional Amortization Method Qualified Affordable Housing Project Investments	$ 3,529	$ 4,217
Proportional Amortization Method Qualified Affordable Housing Project Investments Unfunded Liability Obligation	$ 361	485
Qualified Affordable Housing Project Investments Term	18 years
Proportional Amortization Method Qualified Affordable Housing Project Investments Amortization	$ 688	$ 598	$ 712
Minimum [Member]
Qualified Affordable Housing Project Investments Return Rate	3.00%
Maximum [Member]
Qualified Affordable Housing Project Investments Return Rate	6.00%