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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, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred revenue | $ 5,739 | $ 6,301
Foreign tax credits and general business credits | 11,203 | 9,004
Net operating losses | 1,452 | 1,341
Accruals, including foreign exchange and other | 792 | 1,490
Sub-total Deferred tax assets | 19,186 | 18,136
Valuation allowance | (11,232) | (9,365)
Total deferred tax assets | 7,954 | 8,771
Prepaid registry fees and expenses | (16,909) | (16,237)
Amortization | (7,083) | (6,925)
Limited life intangible assets | (4,327) | (5,958)
Indefinite life intangible assets | (2,847) | (3,110)
Foreign branch deferred tax liability | (1,256) | (2,012)
Total deferred tax liability | (32,422) | (34,242)
Net deferred tax liability | $ (24,468) | $ (25,471)

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