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Note 9 - Income Taxes - Provision for Income Taxes Differs from the Amount Computed by Applying the Statutory Federal Income Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
Income for the year before provision for income taxes	$ 26,155	$ 24,075		$ 25,113
Computed tax expense	5,492	8,185		8,538
State income taxes	846	657		532
Effect of the decrease in Federal tax rate on deferred taxes		(10,036)
Change in Valuation allowance	2,811	1,276
Non-creditable Foreign Tax		2,903
Excess tax benefits on share-based compensation expense	(697)	(2,796)
Permanent differences	159	1,636		290
Others	409	(77)		(314)
Provision for income taxes	$ 9,020	$ 1,748	[1]	$ 9,046	[1]
[1] The Company has initially applied ASC 2014-09 (Topic 606) using the modified retrospective method. Under this method, the comparative information is not restated.

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- Definition

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 change in valuation allowance on pre-2017 foreign tax credits.

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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 effect of decrease in Federal Tax Rate on deferred taxes.

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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 non-creditable 2017 foreign tax.

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Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

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