Note 5 - Qualified Affordable Housing Partnership Investments - Original Investment in LIHTC Projects (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Original Investment	$ 8,954	$ 7,954
Current Recorded Investment	3,389	2,529
Unfunded Liability Obligation	1,338	338
Tax Credits and Benefits	154	139
Amortization of Investments	140	132
Net Income Tax Benefit	14	7
Raymond James California Housing Opportunities Fund II [Member]
Original Investment	2,000	2,000
Current Recorded Investment	807	852
Unfunded Liability Obligation	22	22
Tax Credits and Benefits	50	50
Amortization of Investments	45	45
Net Income Tax Benefit	5	5
WNC Institutional Tax Credit Fun 38 L.P. [Member]
Original Investment	1,000	1,000
Current Recorded Investment	379	400
Unfunded Liability Obligation
Tax Credits and Benefits	26	27
Amortization of Investments	21	23
Net Income Tax Benefit	5	4
Merritt Community Capital Corporation Fund XV, L.P. [Member]
Original Investment	2,500	2,500
Current Recorded Investment	1,013	1,067
Unfunded Liability Obligation	316	316
Tax Credits and Benefits	56	56
Amortization of Investments	54	55
Net Income Tax Benefit	2	1
California Affordable Housing Fund [Member]
Original Investment	2,454	2,454
Current Recorded Investment	200	210
Unfunded Liability Obligation
Tax Credits and Benefits	6	6
Amortization of Investments	10	9
Net Income Tax Benefit	(4)	$ (3)
Boston Capital [Member]
Original Investment	1,000
Current Recorded Investment	990
Unfunded Liability Obligation	1,000
Tax Credits and Benefits	16
Amortization of Investments	10
Net Income Tax Benefit	$ 6