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Note 8 - Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Computed "expected" income tax expense | $ 2,508 | $ 12,182 | $ 8,154
State income taxes, net of federal income tax effect | (351) | 2,610 | 862
831(b) election | (393) | (200) | (290)
Per diem allowances | 1,450 | 1,446 | 2,145
Tax contingency accruals | 601 | (57) | (43)
Valuation allowance, net | 321 |  | (1,167)
Tax credits | (377) | (968) | (1,352)
Impact of Tax Act remeasurement |  |  | (40,123)
Excess tax benefits on share-based compensation | 105 | 50 | (457)
Change in prior year estimates | (420) |  |
Other, net | 20 | 444 | 129
Income tax expense (benefit) | $ 3,464 | $ 15,507 | $ (32,142)

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