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Note 8 - Income Taxes - Components of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
United States	$ 31,246	$ 45,166	$ 50,316
Current expense:
Federal	4,058	8,204	7,779
Foreign	353	1,140	1,179
State and local	1,103	1,205	1,042
Total current	5,514	10,549	10,000
Deferred expense (benefit):
Federal	728	(720)	405
Foreign	(349)	(379)	(125)
State and local	165	(99)	57
Total deferred	544	(1,198)	337
Income tax expense	6,058	9,351	10,337
UNITED STATES
United States	28,493	41,234	45,271
Foreign Countries [Member]
United States	$ 2,753	$ 3,932	$ 5,045

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