Note 5 - Qualified Affordable Housing Partnership Investments - Generated Tax Credits and Benefits From Investments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Generated tax credits	$ 114	$ 120
Tax benefits from taxable losses	25	26
Raymond James California Housing Opportunities Fund II [Member]
Generated tax credits	43	43
Tax benefits from taxable losses	7	7
WNC Institutional Tax Credit Fun 38 L.P. [Member]
Generated tax credits	23	28
Tax benefits from taxable losses	4	4
Merritt Community Capital Corporation Fund XV, L.P. [Member]
Generated tax credits	48	48
Tax benefits from taxable losses	8	8
California Affordable Housing Fund [Member]
Generated tax credits		1
Tax benefits from taxable losses	$ 6	$ 7