Note 6 - Qualified Affordable Housing Partnership Investments - Generated Tax Credits and Benefits from Investments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Generated tax credits	$ 158	$ 164	$ 316	$ 327
Tax benefits from taxable losses	45	48	89	96
Raymond James California Housing Opportunities Fund II [Member]
Generated tax credits	44	46	88	92
Tax benefits from taxable losses	12	13	24	27
WNC Institutional Tax Credit Fun 38 L.P. [Member]
Generated tax credits	28	27	57	53
Tax benefits from taxable losses	7	9	13	18
Merritt Community Capital Corporation Fund XV, L.P. [Member]
Generated tax credits	54	51	108	103
Tax benefits from taxable losses	14	15	28	30
California Affordable Housing Fund [Member]
Generated tax credits	32	40	63	79
Tax benefits from taxable losses	$ 12	$ 11	$ 24	$ 21