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Note 17 - Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income tax expense (benefit) at federal statutory rate | $ 3,583 | $ (3,322) | $ (3,755)
State benefit, net of federal income tax effect | (218) | (472) | (286)
Federal and state income tax credits | (7) | 36 | (154)
Change in valuation allowance | (2,618) | 1,570 | 585
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) | (4)
Nondeductible expenses | 427 | 63 | 63
Foreign rate differential | 77 |  |
Nontaxable adjustment to contingent consideration |  |  | (580)
Other | 101 | (52) | 33
Income tax benefit | $ (3,252) | $ (1,100) | $ (4,098)
Effective income tax rate | (19.10%) | (11.60%) | (37.80%)

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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