Note 22 - Qualified Affordable Housing Partnership Investments (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Proportional Amortization Method Qualified Affordable Housing Project Investments	$ 3,020	$ 3,529
Proportional Amortization Method Qualified Affordable Housing Project Investments Unfunded Liability Obligation	$ 343	361
Qualified Affordable Housing Project Investments Term	18 years
Proportional Amortization Method Qualified Affordable Housing Project Investments Amortization	$ 528	$ 688	$ 598
Minimum [Member]
Qualified Affordable Housing Project Investments Return Rate	3.00%
Maximum [Member]
Qualified Affordable Housing Project Investments Return Rate	5.00%