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Note 8 - Income Taxes - Components of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
United States	$ 45,166	$ 50,316	$ 39,378
Current expense:
Federal	8,204	7,779	16,489
Foreign	1,140	1,179	1,243
State and local	1,205	1,042	1,231
Total current	10,549	10,000	18,963
Deferred expense (benefit):
Federal	(720)	405	(5,968)
Foreign	(379)	(125)	51
State and local	(99)	57	(223)
Total deferred	(1,198)	337	(6,140)
Income tax expense	9,351	10,337	12,823
UNITED STATES
United States	41,234	45,271	33,277
Foreign Countries [Member]
United States	$ 3,932	$ 5,045	$ 6,101

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