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Note 9 - Income Taxes (Details) - Tax Effects of Temporary Differences That Give Rise to Significant Portions of the Deferred Tax Assets and Liabilities (USD $)
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:    
Deferred revenue $ 5,294,767us-gaap_DeferredTaxAssetsDeferredIncome $ 5,300,868us-gaap_DeferredTaxAssetsDeferredIncome
Losses   290,714us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Foreign tax credit 3,200,961us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign 1,914,090us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign
Amortization (414,345)us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment 69,169us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Accruals, including foreign exchange and other (702,764)us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals (1,123,278)us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals
Deferred tax assets 7,378,619us-gaap_DeferredTaxAssetsGross 6,451,563us-gaap_DeferredTaxAssetsGross
Deferred income tax asset, current portion 2,498,196us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 1,081,526us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Deferred income tax asset, long-term portion 4,880,423us-gaap_DeferredTaxAssetsGrossNoncurrent 5,370,037us-gaap_DeferredTaxAssetsGrossNoncurrent
7,378,619us-gaap_DeferredTaxAssetsGross 6,451,563us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities:    
Limited life intangible assets (208,620)us-gaap_DeferredTaxLiabilitiesOtherFiniteLivedAssets (301,500)us-gaap_DeferredTaxLiabilitiesOtherFiniteLivedAssets
Indefinite life intangible assets (4,578,731)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets (4,840,000)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Total deferred tax liability, long-term portion $ (4,787,351)us-gaap_DeferredTaxLiabilitiesNoncurrent $ (5,141,500)us-gaap_DeferredTaxLiabilitiesNoncurrent