Note 5 - Qualified Affordable Housing Partnership Investments - Generated Tax Credits and Benefits from Investments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Generated tax credits	$ 157	$ 164	$ 473	$ 491
Tax benefits from taxable losses	46	49	135	147
Raymond James California Housing Opportunities Fund II [Member]
Generated tax credits	44	46	132	138
Tax benefits from taxable losses	12	13	36	40
WNC Institutional Tax Credit Fun 38 L.P. [Member]
Generated tax credits	28	27	85	80
Tax benefits from taxable losses	7	9	20	27
Merritt Community Capital Corporation Fund XV, L.P. [Member]
Generated tax credits	54	51	162	154
Tax benefits from taxable losses	14	15	41	45
California Affordable Housing Fund [Member]
Generated tax credits	31	40	94	119
Tax benefits from taxable losses	$ 13	$ 12	$ 38	$ 35