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Note 8 - Qualified Affordable Housing Partnership Investments (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Proportional Amortization Method Qualified Affordable Housing Project Investments $ 4,046   $ 4,217
Proportional Amortization Method Qualified Affordable Housing Project Investments Unfunded Liability Obligation $ 478   485
Qualified Affordable Housing Project Investments Term 18 years    
Proportional Amortization Method Qualified Affordable Housing Project Investments Amortization $ 171 $ 180 $ 598
Minimum [Member]      
Qualified Affordable Housing Project Investments Return Rate 5.00%    
Maximum [Member]      
Qualified Affordable Housing Project Investments Return Rate 8.00%