Note 9 - Income Taxes - Components of Deferred Income Tax Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
State tax credits	$ 812	$ 757
Unfunded pension liability	965	1,840
Reserves and accruals	4,124	3,181
Federal, state and foreign net operating loss and credit carryforwards	7,586	7,744
Depreciation	488	604
Amortization	130	142
Lease accounting	4,592	3,217
Other accruals	6,364	5,452
Total deferred tax assets	25,061	22,937
Depreciation	2,450	1,992
Amortization	6,483	6,541
Lease accounting	4,522	3,110
Other accruals	573	330
Total deferred tax liabilities	14,028	11,973
Valuation allowance	8,059	6,289
Net deferred tax assets	$ 2,974	$ 4,675