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Note 9 - Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
|  | Year ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Income for the year before provision for income taxes |  | $ | 24,074,768 |  |  | $ | 25,112,924 |  |  | $ | 17,942,957 |
Computed tax expense |  |  | 8,185,420 |  |  |  | 8,538,245 |  |  |  | 6,100,605 |
Increase (reduction) in income tax expense resulting from: |  |  |  |  |  |  |  |  |
State income taxes |  |  | 656,603 |  |  |  | 530,803 |  |  |  | 265,489 |
Effect of the decrease in Federal tax rate on deferred taxes |  |  | (10,036,080 | ) |  |  | - |  |  |  | - |
Valuation allowance on pre-2017 Foreign Tax Credits |  |  | 1,275,937 |  |  |  | - |  |  |  | - |
Non-creditable 2017 Foreign Tax |  |  | 2,903,400 |  |  |  | - |  |  |  | - |
Excess tax benefits on share-based compensation expense |  |  | (2,796,171 | ) |  |  | - |  |  |  | - |
Permanent differences |  |  | 1,635,611 |  |  |  | 290,327 |  |  |  | 278,959 |
Others |  |  | (76,546 | ) |  |  | (313,605 | ) |  |  | (75,826 | )
Provision for income taxes |  | $ | 1,748,174 |  |  | $ | 9,045,770 |  |  | $ | 6,569,227 |
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] |
|  | December 31, 201 7 |  |  | December 31, 201 6 |
Deferred tax assets (liabilities) : |  |  |  |  |  |  |  |
Deferred tax assets : |  |  |  |  |  |  |  |
Deferred revenu e |  | $ | 7,573,276 |  |  | $ | 5,482,080 |
Foreign tax credit s |  |  | 1,275,937 |  |  |  | 1,275,937 |
Amortizatio n |  |  | (1,936,615 | ) |  |  | (2,184,944 | )
Net operating losse s |  |  | 2,544,862 |  |  |  | - |
Accruals, including foreign exchange and othe r |  |  | 517,493 |  |  |  | 1,135,652 |
Sub-total Deferred tax asset s |  |  | 9,974,953 |  |  |  | 5,708,725 |
Valuation allowance |  |  | (1,275,937 | ) |  |  | - |
Total deferred tax asset s |  | $ | 8,699,016 |  |  | $ | 5,708,725 |
Deferred tax liabilities : |  |  |  |  |  |  |  |  |
Prepaid registry fees and expense s |  | $ | (18,051,222 | ) |  | $ | - |
Limited life intangible asset s |  |  | (7,371,264 | ) |  |  | (120,232 | )
Indefinite life intangible asset s |  |  | (3,110,208 | ) |  |  | (4,706,960 | )
Total deferred tax liability |  | $ | (28,532,694 | ) |  | $ | (4,827,192 | )
Net deferred tax asset (liability ) |  | $ | (19,833,678 | ) |  | $ | 881,533 |
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] |
Total Gross Unrecognized Tax Benefits |  | December 31, 201 7 |  |  | December 31, 201 6 |
Balance, beginning of year |  | $ | 117,000 |  |  | $ | 117,000 |
Change in uncertain tax benefits |  |  | (102,000 | ) |  |  | — |
Balance, end of year |  | $ | 15,000 |  |  | $ | 117,000 |

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