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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)

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