Note 5 - Qualified Affordable Housing Partnership Investments - Original Investment in LIHTC Projects (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Original Investment	$ 7,954		$ 7,954		$ 7,954
Current Recorded Investment	3,114		3,114		3,529
Unfunded Liability Obligation	329		329		361
Tax Credits and Benefits			438	$ 607
Amortization of Investments	138	$ 177	415	512
Net Income Tax Benefit			23	95
Raymond James California Housing Opportunities Fund II [Member]
Original Investment	2,000		2,000		2,000
Current Recorded Investment	1,049		1,049		1,182
Unfunded Liability Obligation	14		14		20
Tax Credits and Benefits			150	168
Amortization of Investments			133	140
Net Income Tax Benefit			17	28
WNC Institutional Tax Credit Fun 38 L.P. [Member]
Original Investment	1,000		1,000		1,000
Current Recorded Investment	510		510		589
Unfunded Liability Obligation
Tax Credits and Benefits			95	104
Amortization of Investments			79	79
Net Income Tax Benefit			16	25
Merritt Community Capital Corporation Fund XV, L.P. [Member]
Original Investment	2,500		2,500		2,500
Current Recorded Investment	1,309		1,309		1,476
Unfunded Liability Obligation	315		315		341
Tax Credits and Benefits			170	203
Amortization of Investments			167	166
Net Income Tax Benefit			3	37
California Affordable Housing Fund [Member]
Original Investment	2,454		2,454		2,454
Current Recorded Investment	246		246		282
Unfunded Liability Obligation
Tax Credits and Benefits			23	132
Amortization of Investments			36	127
Net Income Tax Benefit			$ (13)	$ 5