Note 5 - Qualified Affordable Housing Partnership Investments - Original Investment in LIHTC Projects (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Original Investment	$ 7,954		$ 7,954		$ 7,954
Current Recorded Investment	3,705		3,705		4,217
Unfunded Liability Obligation	467		467		485
Tax Credits and Benefits			608		638
Amortization of Investments	177	$ 180	512	$ 540	540
Net Income Tax Benefit			96		98
Raymond James California Housing Opportunities Fund II [Member]
Original Investment	2,000		2,000		2,000
Current Recorded Investment	1,222		1,222		1,361
Unfunded Liability Obligation	45		45		45
Tax Credits and Benefits			168		178
Amortization of Investments			140		136
Net Income Tax Benefit			28		42
WNC Institutional Tax Credit Fun 38 L.P. [Member]
Original Investment	1,000		1,000		1,000
Current Recorded Investment	618		618		698
Unfunded Liability Obligation	55		55		73
Tax Credits and Benefits			105		107
Amortization of Investments			79		78
Net Income Tax Benefit			26		29
Merritt Community Capital Corporation Fund XV, L.P. [Member]
Original Investment	2,500		2,500		2,500
Current Recorded Investment	1,547		1,547		1,713
Unfunded Liability Obligation	367		367		367
Tax Credits and Benefits			203		199
Amortization of Investments			166		171
Net Income Tax Benefit			37		28
California Affordable Housing Fund [Member]
Original Investment	2,454		2,454		2,454
Current Recorded Investment	318		318		445
Unfunded Liability Obligation
Tax Credits and Benefits			132		154
Amortization of Investments			127		155
Net Income Tax Benefit			$ 5		$ (1)