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Note F - Income Taxes - Reconciliation of Income Tax Expense By Applying The Statutory Federal Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income taxes at statutory rate	$ 12,769	$ 13,043	$ 18,807
State and local income taxes, net of federal tax benefit	576	680	674
Research and development tax credits	(371)	(380)	(371)
Domestic production activities deduction	(822)	(964)	(1,324)
Lower foreign taxes differential	(820)	(476)	(583)
Uncertain tax positions	(93)	26	53
Valuation allowance		(59)	174
Other	360	287	163
Income tax expense	$ 11,599	$ 12,157	$ 17,593

X

- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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Amount of the difference between reported income tax expense (benefit) and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for qualified production activity.

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