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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, 2016
Dec. 31, 2015
Deferred tax assets:    
Deferred revenue $ 5,482,080 $ 5,454,284
Foreign tax credit 1,275,937 1,529,075
Amortization (2,184,944) (883,466)
Accruals, including foreign exchange and other 1,135,652 1,521,199
Deferred tax assets 5,708,725 7,621,092
Deferred tax liabilities:    
Limited life intangible assets (120,232) (169,731)
Indefinite life intangible assets (4,706,960) (4,706,960)
Total deferred tax liability, long-term portion $ (4,827,192) $ (4,876,691)