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Note 9 - Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
|  | Year ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Income for the year before provision for income taxes |  | $ | 26,155 |  |  | $ | 24,075 |  |  | $ | 25,113 |
Computed tax expense |  |  | 5,492 |  |  |  | 8,185 |  |  |  | 8,538 |
Increase (reduction) in income tax expense resulting from: |  |  |  |  |  |  |  |  |  |  |  |
State income taxes |  |  | 846 |  |  |  | 657 |  |  |  | 532 |
Effect of the decrease in Federal tax rate on deferred taxes |  |  | - |  |  |  | (10,036 | ) |  |  | - |
Change in Valuation allowance |  |  | 2,811 |  |  |  | 1,276 |  |  |  | - |
Non-creditable Foreign Tax |  |  | - |  |  |  | 2,903 |  |  |  | - |
Excess tax benefits on share-based compensation expense |  |  | (697 | ) |  |  | (2,796 | ) |  |  | - |
Permanent differences |  |  | 159 |  |  |  | 1,636 |  |  |  | 290 |
Others |  |  | 409 |  |  |  | (77 | ) |  |  | (314 | )
Provision for income taxes |  | $ | 9,020 |  |  | $ | 1,748 |  |  | $ | 9,046 |
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] |
|  | December 31, 2018 |  |  | December 31, 2017 |
Deferred tax assets (liabilities): |  |  |  |  |  |  |  |
Deferred tax assets: |  |  |  |  |  |  |  |
Deferred revenue |  | $ | 6,497 |  |  | $ | 7,573 |
Foreign tax credits |  |  | 3,865 |  |  |  | 1,276 |
Amortization |  |  | (5,872 | ) |  |  | (1,937 | )
Net operating losses |  |  | 1,892 |  |  |  | 2,545 |
Accruals, including foreign exchange and other |  |  | 1,955 |  |  |  | 517 |
Sub-total Deferred tax assets |  |  | 8,337 |  |  |  | 9,974 |
Valuation allowance |  |  | (4,087 | ) |  |  | (1,276 | )
Total deferred tax assets |  | $ | 4,250 |  |  | $ | 8,698 |
Deferred tax liabilities: |  |  |  |  |  |  |  |
Prepaid registry fees and expenses |  | $ | (15,950 | ) |  | $ | (18,051 | )
Limited life intangible assets |  |  | (6,115 | ) |  |  | (7,371 | )
Indefinite life intangible assets |  |  | (3,110 | ) |  |  | (3,110 | )
Total deferred tax liability |  | $ | (25,175 | ) |  | $ | (28,532 | )
Net deferred tax asset (liability) |  | $ | (20,925 | ) |  | $ | (19,834 | )
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] |
Total Gross Unrecognized Tax Benefits |  | December 31, 2018 |  |  | December 31, 2017 |
Balance, beginning of year |  | $ | 15 |  |  | $ | 117 |
Change in uncertain tax benefits |  |  | (15 | ) |  |  | (102 | )
Balance, end of year |  | $ | - |  |  | $ | 15 |

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