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Note 9 - Income Taxes - Tax Effects of Temporary Differences That Give Rise to Significant Portions of the Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax assets: |  |
Deferred revenue | $ 6,497 | $ 7,573
Foreign tax credits | 3,865 | 1,276
Amortization | (5,872) | (1,937)
Net operating losses | 1,892 | 2,545
Accruals, including foreign exchange and other | 1,955 | 517
Sub-total Deferred tax assets | 8,337 | 9,974
Valuation allowance | (4,087) | (1,276)
Total deferred tax assets | 4,250 | 8,698
Deferred tax liabilities: |  |
Prepaid registry fees and expenses | (15,950) | (18,051)
Limited life intangible assets | (6,115) | (7,371)
Indefinite life intangible assets | (3,110) | (3,110)
Total deferred tax liability | (25,175) | (28,532)
Net deferred tax liability | $ (20,925) | $ (19,834)

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