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Note 8 - Income Taxes - Reconciliation of Income Tax Expense By Applying the Statutory Federal Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income taxes at statutory rate	$ 9,485	$ 10,566	$ 13,782
State and local income taxes, net of federal tax benefit	803	832	555
Tax credits	(898)	(506)	(295)
Domestic production activities deduction			(1,191)
Lower foreign taxes differential	(65)	(5)	(842)
Uncertain tax positions	164	172	346
Valuation allowance	71	37	100
Federal tax reform – deferred rate change		(581)	(1,624)
Deemed mandatory repatriation		(48)	1,370
Foreign withholding tax			600
Other	(209)	(130)	22
Income tax expense	$ 9,351	$ 10,337	$ 12,823

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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 deemed mandatory repatriation.

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