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Note 6 - Income Taxes - Components of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
United States	$ 39,378	$ 36,482	$ 37,266
Current expense:
Federal	16,489	6,960	11,465
Foreign	1,243	547	292
State and local	1,231	581	963
Total current	18,963	8,088	12,720
Deferred expense (benefit):
Federal	(5,968)	3,429	(443)
Foreign	51	(184)	(112)
State and local	(223)	266	(8)
Total deferred	(6,140)	3,511	(563)
Income tax expense	12,823	11,599	12,157
UNITED STATES
United States	33,277	33,101	35,391
Foreign Countries [Member]
United States	$ 6,101	$ 3,381	$ 1,875

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