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Note 7 - Income Tax Expense - Deferred Income Tax Asset (Liability) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Pension accruals | $ 3,742 | $ 2,588
Operating reserves and other accruals | 5,110 | 2,540
Tax credits | 513 | 923
Valuation allowance on tax credits | 0 | (923)
Book carrying value in excess of tax basis of property | (2,116) | (1,544)
Book carrying value in excess of tax basis of intangibles | (5,780) | (7,024)
Tax effect of revenue recognition standard ASC 606 | (1,021) | (1,771)
Deferred expenses | (898) | (1,831)
Net deferred income tax liability | $ (450) | $ (7,042)

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