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Note 10 - Income Taxes (Details) - Tax Effects of Temporary Differences That Give Rise to Significant Portions of the Deferred Tax Assets and Liabilities - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Deferred tax assets:    
Deferred revenue $ 5,454,284 $ 5,294,767
Foreign tax credit 1,529,075 3,200,961
Amortization (883,466) (414,345)
Accruals, including foreign exchange and other 1,521,199 (702,764)
Deferred tax assets 7,621,092 7,378,619
Deferred income tax asset, current portion 3,243,718 2,498,196
Deferred income tax asset, long-term portion 4,377,374 4,880,423
7,621,092 7,378,619
Deferred tax liabilities:    
Limited life intangible assets (169,731) (208,620)
Indefinite life intangible assets (4,706,960) (4,578,731)
Total deferred tax liability, long-term portion $ (4,876,691) $ (4,787,351)