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Note 7 - Income Tax Expense - Deferred Income Tax Asset (Liability) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Pension accruals	$ 4,023	$ 3,742
Operating reserves and other accruals	5,520	5,110
Tax credits	527	513
Book carrying value in excess of tax basis of property	(4,814)	(2,116)
Book carrying value in excess of tax basis of intangibles	(5,076)	(5,780)
Tax effect of revenue recognition standard ASC 606	0	(1,021)
Deferred expenses	(539)	(898)
Net deferred income tax liability	$ (359)	$ (450)

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Amount of deferred tax liability attributable to taxable temporary differences from tax effect of revenue recognition standard ASC 606.

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Amount, before allocation of a valuation allowances, of deferred tax assets attributable to deductible tax credit carryforwards including, but not limited to, research, foreign, general business, alternative minimum tax, and other deductible tax credit carryforwards.

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