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Note 9 - Income Taxes - Components of Deferred Income Tax Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
State tax credits | $ 1,046 | $ 1,000
Unfunded pension liability | 1,102 | 605
Reserves and accruals | 2,721 | 2,483
Federal, state and foreign net operating loss and credit carryforwards | 8,042 | 8,370
Depreciation | 686 | 850
Amortization | 698 |
Lease accounting | 3,961 |
Other accruals | 5,079 | 5,641
Total deferred tax assets | 23,335 | 18,949
Depreciation | 1,901 | 1,666
Amortization | 6,973 | 7,930
Lease accounting | 3,871 |
Other accruals | 370 | 893
Total deferred tax liabilities | 13,115 | 10,489
Valuation allowance | 8,216 | 9,200
Net deferred tax liabilities | $ 2,004 |
Net deferred tax assets |  | $ (740)

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