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Note 14 - Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2013
Income Tax Disclosure [Abstract] |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] |
|  | Year ended December 31, |
|  | 2013 |  |  | 2012 |  |  | 2011 |
Income (loss) before income taxes |  |  |  |  |  |  |  |  |
Domestic |  | $ | 33,060,976 |  |  | $ | 26,170,313 |  |  | $ | 15,962,992 |
Foreign |  |  | (581,445 | ) |  |  | (6,642,892 | ) |  |  | (2,177,978 | )
|  | $ | 32,479,531 |  |  | $ | 19,527,421 |  |  | $ | 13,785,014 |
|  | Year ended December 31, |
|  | 2013 |  |  | 2012 |  |  | 2011 |
Provision for (benefit from) income taxes: |  |  |  |  |  |  |  |  |
Current provision: |  |  |  |  |  |  |  |  |
Federal |  | $ | 8,024,303 |  |  | $ | 7,594,287 |  |  | $ | 3,327,626 |
State |  |  | 1,580,963 |  |  |  | 885,958 |  |  |  | 155,855 |
Foreign |  |  | 94,136 |  |  |  | (188,650 | ) |  |  | 90,626 |
|  |  | 9,699,402 |  |  |  | 8,291,595 |  |  |  | 3,574,107 |
Deferred provision: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  | 2,374,850 |  |  |  | 776,486 |  |  |  | 1,907,408 |
State |  |  | 114,546 |  |  |  | 602,447 |  |  |  | 570,869 |
Foreign |  |  | (283,788 | ) |  |  | (1,900,567 | ) |  |  | (734,050 | )
|  |  | 2,205,608 |  |  |  | (521,634 | ) |  |  | 1,744,227 |
Total provision |  | $ | 11,905,010 |  |  | $ | 7,769,961 |  |  | $ | 5,318,334 |
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] |
|  | December 31, |
|  | 2013 |  |  | 2012 |
Deferred tax assets: |  |  |  |  |  |
Deferred revenue |  | $ | 852,207 |  |  | $ | 1,988,509 |
Stock-based compensation expense |  |  | 1,358,554 |  |  |  | 1,584,583 |
Tax credit carry forward |  |  | 19,967 |  |  |  | 194,364 |
Net operating loss carryforward, foreign |  |  | 2,578,640 |  |  |  | 2,520,746 |
Accrued expenses and other |  |  | 649,402 |  |  |  | 954,559 |
Inventory reserve |  |  | 283,996 |  |  |  | 405,302 |
Deferred tax asset |  | $ | 5,742,766 |  |  | $ | 7,648,063 |
|  | December 31, |
|  | 2013 |  |  | 2012 |
Deferred tax liabilities: |  |  |  |  |  |
Acquisition-related Intangibles |  | $ | (6,056,162 | ) |  | $ | (6,482,404 | )
Depreciation |  |  | (6,964,428 | ) |  |  | (6,131,473 | )
Deferred tax liability |  | $ | (13,020,590 | ) |  | $ | (12,613,877 | )
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
|  | Year ended December 31, |
|  | 2013 |  |  | 2012 |  |  | 2011 |
Statutory federal income tax rate |  |  | 35.0 | % |  |  | 35.0 | % |  |  | 34.0 | %
State tax expense, net of federal benefit |  |  | 4.8 | % |  |  | 6.4 | % |  |  | 5.7 | %
Permanent items, including nondeductible expenses |  |  | (0.2 | %) |  |  | 0.9 | % |  |  | 0.9 | %
State investment tax credit |  |  | (0.1 | %) |  |  | (0.2 | %) |  |  | (0.2 | %)
Federal, state and foreign research and development credits |  |  | (0.5 | %) |  |  | (1.2 | %) |  |  | (0.4 | %)
Foreign rate differential |  |  | 0.1 | % |  |  | 2.5 | % |  |  | 0.9 | %
Domestic production deduction |  |  | (2.4 | %) |  |  | (3.6 | %) |  |  | (2.3 | %)
Effective income tax rate |  |  | 36.7 | % |  |  | 39.8 | % |  |  | 38.6 | %
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] |
|  | Year ended December 31, |
|  | 2013 |  |  | 2012 |  |  | 2011 |
Unrecognized tax benefit, beginning of year |  | $ | 56,170 |  |  | $ | 56,170 |  |  | $ | 37,428 |
Tax positions related to current year |  |  | - |  |  |  | - |  |  |  | 38,329 |
Tax positions related to prior years |  |  | - |  |  |  | 38,329 |  |  |  | (19,587 | )
Statute expirations |  |  | (56,170 | ) |  |  | (38,329 | ) |  |  | - |
Unrecognized tax benefit, end of year |  | $ | - |  |  | $ | 56,170 |  |  | $ | 56,170 |

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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