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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, 2020	Dec. 31, 2019	Dec. 31, 2018
Income for the year before provision for income taxes	$ 10,760	$ 24,571	$ 26,155
Computed federal tax expense	2,259	5,160	5,492
State income taxes	303	526	846
Change in Valuation allowance	1,867	5,277	2,811
Expired business tax credits	1,044	0	0
Non-creditable Foreign Tax	818	515	0
Excess tax benefits on share-based compensation expense	(407)	(634)	(697)
Permanent differences	(161)	(103)	159
Effect of deferred tax in foreign branch	(774)	(840)	0
Others	36	(728)	409
Provision for income taxes	$ 4,985	$ 9,173	$ 9,020	[1]
[1] The Company has initially applied ASC 2016-02 (Topic 842) on January 1, 2019 (note 2 (u)). The accounting standard was adopted using the modified retrospective method, under this method the comparative period was not restated.

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