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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)