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Note 9 - Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
|  | Year ended December 31, 201 6 |  |  | Year ended December 31, 201 5 |  |  | Year ended December 31, 201 4 |
Income for the year before provision for income taxes |  | $ | 25,112,924 |  |  | $ | 17,942,957 |  |  | $ | 9,428,325 |
Computed expected tax expense |  | $ | 8,538,245 |  |  | $ | 6,100,605 |  |  | $ | 3,205,631 |
Increase (reduction) in income tax expense resulting from: |  |  |  |  |  |  |  |  |  |  |  |
State income taxes |  |  | 530,803 |  |  |  | 265,489 |  |  |  | 64,056 |
Permanent differences, including foreign exchange |  |  | 290,327 |  |  |  | 278,959 |  |  |  | 192,260 |
Other, including alternative minimum tax and adjustments to opening deferred tax assets |  |  | (313,605 | ) |  |  | (75,826 | ) |  |  | (407,718 | )
Provision for income taxes |  | $ | 9,045,770 |  |  | $ | 6,569,227 |  |  | $ | 3,054,229 |
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] |
|  | December 31, 201 6 |  |  | December 31, 201 5 |
Deferred tax assets: |  |  |  |  |  |  |  |
Deferred revenue |  | $ | 5,482,080 |  |  | $ | 5,454,284 |
Foreign tax credit |  |  | 1,275,937 |  |  |  | 1,529,075 |
Amortization |  |  | (2,184,944 | ) |  |  | (883,466 | )
Accruals, including foreign exchange and other |  |  | 1,135,652 |  |  |  | 1,521,199 |
Deferred tax assets |  | $ | 5,708,725 |  |  | $ | 7,621,092 |
Deferred tax liabilities: |  |  |  |  |  |  |  |
Limited life intangible assets |  | $ | (120,232 | ) |  | $ | (169,731 |
Indefinite life intangible assets |  |  | (4,706,960 | ) |  |  | (4,706,960 | )
Total deferred tax liability, long-term portion |  | $ | (4,827,192 | ) |  | $ | (4,876,691 | )
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] |
Total Gross Unrecognized Tax Benefits |  | December 31, 201 6 |  |  | December 31, 201 5 |
Balance, beginning of year |  | $ | 117,000 |  |  | $ | 117,000 |
Change in uncertain tax benefits |  |  | — |  |  |  | — |
Balance, end of year |  | $ | 117,000 |  |  | $ | 117,000 |

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