Note 5 - Low Income Housing Tax Credit Partnerships - Original Investment in LIHTC Projects (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Original Investment	$ 8,954		$ 8,954
Current Recorded Investment	2,777		2,927
Unfunded Liability Obligation	1,219		1,319
Tax Credits and Benefits	156	$ 154
Amortization of Investments	150	140
Net Income Tax Benefit	6	14
Raymond James California Housing Opportunities Fund II [Member]
Original Investment	2,000		2,000
Current Recorded Investment	632		676
Unfunded Liability Obligation	16		16
Tax Credits and Benefits	48	50
Amortization of Investments	44	45
Net Income Tax Benefit	4	5
WNC Institutional Tax Credit Fun 38 L.P. [Member]
Original Investment	1,000		1,000
Current Recorded Investment	290		311
Unfunded Liability Obligation	0		0
Tax Credits and Benefits	24	26
Amortization of Investments	21	21
Net Income Tax Benefit	3	5
Merritt Community Capital Corporation Fund XV, L.P. [Member]
Original Investment	2,500		2,500
Current Recorded Investment	784		841
Unfunded Liability Obligation	316		316
Tax Credits and Benefits	53	56
Amortization of Investments	57	54
Net Income Tax Benefit	(4)	2
California Affordable Housing Fund [Member]
Original Investment	2,454		2,454
Current Recorded Investment	146		152
Unfunded Liability Obligation	0		0
Tax Credits and Benefits	3	6
Amortization of Investments	6	10
Net Income Tax Benefit	(3)	(4)
Boston Capital [Member]
Original Investment	1,000		1,000
Current Recorded Investment	925		947
Unfunded Liability Obligation	887		$ 987
Tax Credits and Benefits	28	16
Amortization of Investments	22	10
Net Income Tax Benefit	$ 6	$ 6