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Note F - Income Taxes - Components of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
United States	$ 36,482	$ 37,266	$ 53,734
Current expense:
Federal	6,960	11,465	16,638
Foreign	547	292	946
State and local	581	963	1,376
Total current	8,088	12,720	18,960
Deferred expense (benefit):
Federal	3,429	(443)	(1,181)
Foreign	(184)	(112)	(114)
State and local	266	(8)	(72)
Total deferred	3,511	(563)	(1,367)
Income tax expense	11,599	12,157	17,593
UNITED STATES
United States	33,101	35,391	49,692
Foreign Countries [Member]
United States	$ 3,381	$ 1,875	$ 4,042

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