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Note 17 - Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income tax expense (benefit) at federal statutory rate | $ 6,854 | $ 3,583 | $ (3,322)
State expense (benefit), net of federal income tax effect | 1,261 | (218) | (472)
Federal and state income tax credits |  | (7) | 36
Change in valuation allowance | (3,564) | (2,618) | 1,570
Tax windfall on share-based compensation |  | (369) |
Excess income tax shortfall on share-based compensation |  |  | 765
Bargain purchase gain |  | (4,228) |
Effect of Tax Cuts and Jobs Act of 2017 |  |  | 874
Uncertain income tax positions |  |  | (562)
Foreign rate differential | 36 | 77 |
Other | 151 | 528 | 11
Income tax expense (benefit) | $ 4,738 | $ (3,252) | $ (1,100)
Effective income tax rate | 14.50% | (19.10%) | (11.60%)

X
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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 the excess tax shortfall on stock based compensation. + References No definition available. + Details
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