Note 5 - Low Income Housing Tax Credit Partnerships - Original Investment in LIHTC Projects (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Original Investment	$ 8,954		$ 8,954
Current Recorded Investment	2,627		2,927
Unfunded Liability Obligation	945		1,319
Tax Credits and Benefits	312	$ 308
Amortization of Investments	300	285
Net Income Tax Benefit	12	23
Raymond James California Housing Opportunities Fund II [Member]
Original Investment	2,000		2,000
Current Recorded Investment	588		676
Unfunded Liability Obligation	16		16
Tax Credits and Benefits	95	99
Amortization of Investments	88	90
Net Income Tax Benefit	7	9
WNC Institutional Tax Credit Fun 38 L.P. [Member]
Original Investment	1,000		1,000
Current Recorded Investment	269		311
Unfunded Liability Obligation	0		0
Tax Credits and Benefits	47	52
Amortization of Investments	42	43
Net Income Tax Benefit	5	9
Merritt Community Capital Corporation Fund XV, L.P. [Member]
Original Investment	2,500		2,500
Current Recorded Investment	728		841
Unfunded Liability Obligation	306		316
Tax Credits and Benefits	107	112
Amortization of Investments	113	109
Net Income Tax Benefit	(6)	3
California Affordable Housing Fund [Member]
Original Investment	2,454		2,454
Current Recorded Investment	140		152
Unfunded Liability Obligation	0		0
Tax Credits and Benefits	7	12
Amortization of Investments	12	19
Net Income Tax Benefit	(5)	(7)
Boston Capital [Member]
Original Investment	1,000		1,000
Current Recorded Investment	902		947
Unfunded Liability Obligation	623		$ 987
Tax Credits and Benefits	56	33
Amortization of Investments	45	24
Net Income Tax Benefit	$ 11	$ 9