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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 ($)
Dec. 31, 2017
Dec. 31, 2016
Deferred revenue $ 7,573,276 $ 5,482,080
Foreign tax credits 1,275,937 1,275,937
Amortization (1,936,615) (2,184,944)
Net operating losses 2,544,862
Accruals, including foreign exchange and other 517,493 1,135,652
Sub-total Deferred tax assets 9,974,953 5,708,725
Valuation allowance (1,275,937)
Total deferred tax assets 0 5,708,725
Prepaid registry fees and expenses (18,051,222)
Limited life intangible assets (7,371,264) (120,232)
Indefinite life intangible assets (3,110,208) (4,706,960)
Total deferred tax liability (28,532,694) (4,827,192)
Net deferred tax liability $ (19,833,678)  
Net deferred tax asset   $ 881,533