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Note 8 - Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Computed "expected" income tax expense | $ 12,182 | $ 8,154 | $ 9,527
State income taxes, net of federal income tax effect | 2,610 | 862 | 953
Per diem allowances | 1,446 | 2,145 | 2,205
Tax contingency accruals | (57) | (43) | (273)
Valuation allowance, net |  | (1,167) |
Tax credits | (1,042) | (1,084) | (694)
Impact of Tax Act remeasurement |  | (40,123) |
Excess tax benefits on share-based compensation | 50 | (457) |
Other, net | 318 | (429) | (1,332)
Actual income tax expense | $ 15,507 | $ (32,142) | $ 10,386

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