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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, 2021	Dec. 31, 2020	Dec. 31, 2019
Income for the year before provision for income taxes	$ 7,270	$ 10,760	$ 24,571
Computed federal tax expense	1,527	2,259	5,160
State income taxes	314	303	526
Foreign earnings	382	(175)	(444)
Changes in valuation allowance	2,300	1,867	5,277
Expired business tax credits	0	1,044	0
Excess tax benefits on share-based compensation	(1,556)	(407)	(634)
Permanent differences	205	(161)	16
Others	734	255	(728)
Provision for income taxes	$ 3,906	$ 4,985	$ 9,173

X

- 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 expired business tax credits.

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Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to excess tax benefit for share-based compensation cost.

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

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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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 foreign income tax expense (benefit).

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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 nondeductible expenses.

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