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Note 5 - Income Taxes - Income Taxes Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Provision for income taxes at federal statutory rate | $ 638 | $ 1,421
Provision for income taxes at federal statutory rate, rate | 21.00% | 34.00%
State income taxes, net of federal benefit | $ (73) | $ 17
State income taxes, net of federal benefit, rate | (2.40%) | 0.40%
Permanent differences | $ (60) | $ 85
Permanent differences, rate | (2.00%) | 2.10%
Federal Research and Development Credit |  | $ 41
Federal Research and Development Credit, rate |  | 1.00%
Foreign tax rate differential | $ 304 | $ (494)
Foreign tax rate differential | 10.00% | (11.80%)
GILTI tax | $ 439 | $ 798
GILTI tax | 14.40% | 19.00%
Reduction in deferred tax asset – Reduction of corporate tax rate |  | $ 1,043
Reduction in deferred tax asset – Reduction of corporate tax rate, rate |  | 24.80%
Other | $ 154 | $ 66
Other, rate | 5.50% | 1.70%
Net expense | $ 1,402 | $ 2,977
Net expense, rate | 46.50% | 71.20%

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