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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, 2022	Dec. 31, 2021	Dec. 31, 2020
Income (loss) for the year before provision for income taxes	$ (27,788)	$ 7,270	$ 10,760
Computed federal tax expense	(5,836)	1,527	2,259
State income taxes	845	314	303
Foreign earnings	386	382	(175)
Changes in valuation allowance	4,023	2,300	1,867
Expired business tax credits	0	0	1,044
Shortfall (excess) tax benefits on share-based compensation	138	(1,556)	(407)
Permanent differences	(112)	205	(161)
Others	339	734	255
Provision (recovery) for income taxes	$ (217)	$ 3,906	$ 4,985

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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 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 expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement.

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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 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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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 state and local income tax expense (benefit).

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