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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, 2019
Dec. 31, 2018
Deferred tax assets:    
Deferred revenue $ 6,301 $ 6,497
Foreign tax credits and general business credits 9,004 3,864
Net operating losses 1,341 1,892
Accruals, including foreign exchange and other 1,490 1,955
Sub-total Deferred tax assets 18,136 14,208
Valuation allowance (9,365) (4,087)
Total deferred tax assets 8,771 10,121
Deferred tax liabilities:    
Prepaid registry fees and expenses (16,237) (15,950)
Amortization (6,925) (5,871)
Limited life intangible assets (5,958) (6,115)
Indefinite life intangible assets (3,110) (3,110)
Foreign branch deferred tax liability (2,012)
Total deferred tax liability (34,242) (31,046)
Net deferred tax liability $ (25,471) $ (20,925)