Note 5 - Qualified Affordable Housing Partnership Investments - Original Investment in LIHTC Projects (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Original Investment	$ 8,954		$ 7,954
Current Recorded Investment	3,244		2,529
Unfunded Liability Obligation	1,338		338
Tax Credits and Benefits	308	$ 278
Amortization of Investments	285	265
Net Income Tax Benefit	23	13
Raymond James California Housing Opportunities Fund II [Member]
Original Investment	2,000		2,000
Current Recorded Investment	762		852
Unfunded Liability Obligation	22		22
Tax Credits and Benefits	99	100
Amortization of Investments	90	90
Net Income Tax Benefit	9	10
WNC Institutional Tax Credit Fun 38 L.P. [Member]
Original Investment	1,000		1,000
Current Recorded Investment	357		400
Unfunded Liability Obligation	0		0
Tax Credits and Benefits	52	54
Amortization of Investments	43	45
Net Income Tax Benefit	9	9
Merritt Community Capital Corporation Fund XV, L.P. [Member]
Original Investment	2,500		2,500
Current Recorded Investment	958		1,067
Unfunded Liability Obligation	316		316
Tax Credits and Benefits	112	112
Amortization of Investments	109	110
Net Income Tax Benefit	3	2
California Affordable Housing Fund [Member]
Original Investment	2,454		2,454
Current Recorded Investment	191		210
Unfunded Liability Obligation	0		$ 0
Tax Credits and Benefits	12	12
Amortization of Investments	19	20
Net Income Tax Benefit	(7)	$ (8)
Boston Capital [Member]
Original Investment	1,000
Current Recorded Investment	976
Unfunded Liability Obligation	1,000
Tax Credits and Benefits	33
Amortization of Investments	24
Net Income Tax Benefit	$ 9