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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 |  | $ 17
State income taxes, net of federal benefit, rate | 0.00% | 0.40%
Permanent differences | $ (277) | $ 85
Permanent differences, rate | (9.10%) | 2.10%
Federal Research and Development Credit |  | $ 41
Federal Research and Development Credit, rate |  | 1.00%
Foreign tax rate differential | $ (437) | $ 494
Foreign tax rate differential | (14.40%) | 11.80%
Foreign dividend tax | $ 309 | $ 798
Foreign dividend tax, rate | 10.20% | 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 | $ 214 | $ 66
Other, rate | 10.20% | 1.70%
Net expense | $ 1,415 | $ 2,977
Net expense, rate | 46.70% | 71.20%

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