Note 9 - Qualified Affordable Housing Project Investments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended			12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015		Sep. 30, 2014	Dec. 31, 2014
Note 9 - Qualified Affordable Housing Project Investments (Details) [Line Items]
Proportional Amortization Method Qualified Affordable Housing Project Investments	$ 4,983		$ 4,983			$ 5,636
Proportional Amortization Method Qualified Affordable Housing Project Investments, Unfunded Liability Obligation	1,453		$ 1,453			2,424
Qualified Affordable Housing Project Investments Term			18 years
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			34.00%
Proportional Amortization Method Qualified Affordable Housing Project Investments, Amortization	$ 181	$ 260	$ 542	[1]	$ 665	$ 903	[1]
Minimum [Member]
Note 9 - Qualified Affordable Housing Project Investments (Details) [Line Items]
Qualified Affordable Housing Project Investments, Return Rate			4.00%
Maximum [Member]
Note 9 - Qualified Affordable Housing Project Investments (Details) [Line Items]
Qualified Affordable Housing Project Investments, Return Rate			8.00%

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