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Note 16 - Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income tax expense at federal statutory rate	$ 5,383	$ 6,854	$ 3,583
State expense (benefit), net of federal income tax effect	953	1,261	(218)
Federal and state income tax credits	0	0	(7)
Change in valuation allowance	(181)	(3,564)	(2,618)
Tax windfall on share-based compensation	0	0	(369)
Bargain purchase gain	0	0	(4,228)
Nondeductible expenses	447	(24)	427
Foreign rate differential	78	36	77
Other	(96)	175	101
Total income tax expense (benefit)	$ 6,584	$ 4,738	$ (3,252)
Effective income tax rate	25.70%	14.50%	(19.10%)

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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 bargain purchase gain (loss).

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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 the tax windfall on stock based compensation.

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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 Federal and State tax credits.

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