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Note 9 - Income Taxes - Components of Deferred Income Tax Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
State tax credits | $ 757 | $ 1,046
Unfunded pension liability | 1,840 | 1,102
Reserves and accruals | 3,181 | 2,721
Federal, state and foreign net operating loss and credit carryforwards | 7,744 | 8,042
Depreciation | 604 | 686
Amortization | 142 | 698
Lease accounting | 3,217 | 3,961
Other accruals | 5,452 | 5,079
Total deferred tax assets | 22,937 | 23,335
Depreciation | 1,992 | 1,901
Amortization | 6,541 | 6,973
Lease accounting | 3,110 | 3,871
Other accruals | 330 | 370
Total deferred tax liabilities | 11,973 | 13,115
Valuation allowance | 6,289 | 8,216
Net deferred tax assets | $ 4,675 | $ 2,004

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