Note 5 - Qualified Affordable Housing Partnership Investments - Original Investment in LIHTC Projects (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Original Investment	$ 7,954		$ 7,954		$ 7,954
Current Recorded Investment	3,252		3,252		3,529
Unfunded Liability Obligation	330		330		361
Tax Credits and Benefits			291	$ 406
Amortization of Investments	138	$ 164	277	335
Net Income Tax Benefit			14	71
Raymond James California Housing Opportunities Fund II [Member]
Original Investment	2,000		2,000		2,000
Current Recorded Investment	1,093		1,093		1,182
Unfunded Liability Obligation	14		14		20
Tax Credits and Benefits			100	112
Amortization of Investments			89	94
Net Income Tax Benefit			11	18
WNC Institutional Tax Credit Fun 38 L.P. [Member]
Original Investment	1,000		1,000		1,000
Current Recorded Investment	537		537		589
Unfunded Liability Obligation
Tax Credits and Benefits			63	70
Amortization of Investments			53	53
Net Income Tax Benefit			10	17
Merritt Community Capital Corporation Fund XV, L.P. [Member]
Original Investment	2,500		2,500		2,500
Current Recorded Investment	1,365		1,365		1,476
Unfunded Liability Obligation	316		316		341
Tax Credits and Benefits			113	136
Amortization of Investments			111	100
Net Income Tax Benefit			2	36
California Affordable Housing Fund [Member]
Original Investment	2,454		2,454		2,454
Current Recorded Investment	257		257		282
Unfunded Liability Obligation
Tax Credits and Benefits			15	88
Amortization of Investments			24	88
Net Income Tax Benefit			$ (9)