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Note 16 - Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] |
|  | Years ended December 31,
|  | 2018 |  | 2017 |  | 2016
Income before income taxes |  |  |  |  |  |  |  |  |  |  |  |
Domestic |  | $ | 26,227 |  |  | $ | 48,446 |  |  | $ | 50,181 |
Foreign |  |  | (3,020 | ) |  |  | (2,244 | ) |  |  | 689 |
|  | $ | 23,207 |  |  | $ | 46,202 |  |  | $ | 50,870 |
|  | Years ended December 31,
|  | 2018 |  | 2017 |  | 2016
Provision for (benefit from) income taxes: |  |  |  |  |  |  |  |  |  |  |  |
Current provision: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 4,783 |  |  | $ | 12,608 |  |  | $ | 14,982 |
State |  |  | 1,644 |  |  |  | 2,737 |  |  |  | 3,265 |
Foreign |  |  | 405 |  |  |  | 31 |  |  |  | 302 |
|  |  | 6,832 |  |  |  | 15,376 |  |  |  | 18,549 |
Deferred provision: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  | (992 | ) |  |  | (426 | ) |  |  | (70 | )
State |  |  | (152 | ) |  |  | (68 | ) |  |  | (84 | )
Foreign |  |  | (1,203 | ) |  |  | (496 | ) |  |  | (72 | )
|  |  | (2,347 | ) |  |  | (990 | ) |  |  | (226 | )
Total provision |  | $ | 4,485 |  |  | $ | 14,386 |  |  | $ | 18,323 |
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] |
|  | December 31,
|  | 2018 |  | 2017
Deferred tax assets: |  |  |  |  |  |  |  |
Net operating loss carry forward, foreign |  | $ | 1,382 |  |  | $ | 959 |
Stock-based compensation expense |  |  | 3,148 |  |  |  | 2,309 |
Foreign currency exchange |  |  | 363 |  |  |  | 265 |
Accrued expenses and other |  |  | 818 |  |  |  | 496 |
Inventory reserve |  |  | 1,500 |  |  |  | 740 |
Deferred tax assets |  | $ | 7,211 |  |  | $ | 4,769 |
|  | December 31,
|  | 2018 |  | 2017
Deferred tax liabilities: |  |  |  |  |  |  |  |
Acquisition-related Intangibles |  | $ | (2,405 | ) |  | $ | (2,743 | )
Depreciation |  |  | (8,348 | ) |  |  | (7,419 | )
Deferred tax liabilities |  | $ | (10,753 | ) |  | $ | (10,162 | )
Net deferred tax liabilities |  | $ | (3,542 | ) |  | $ | (5,393 | )
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
|  | Years ended December 31,
|  | 2018 |  | 2017 |  | 2016
Statutory federal income tax rate |  |  | 21.0 | % |  |  | 35.0 | % |  |  | 35.0 | %
State tax expense, net of federal benefit |  |  | 5.5 | % |  |  | 4.8 | % |  |  | 4.5 | %
Impact of rate change on deferred taxes |  |  | 0.0 | % |  |  | (4.9 | %) |  |  | 0.0 | %
Permanent items, including nondeductible expenses |  |  | (1.4 | %) |  |  | 0.1 | % |  |  | 0.1 | %
State investment tax credit |  |  | (0.2 | %) |  |  | (0.7 | %) |  |  | (0.1 | %)
Federal, state and foreign research and development credits |  |  | (3.4 | %) |  |  | (1.4 | %) |  |  | (0.9 | %)
Foreign rate differential |  |  | (0.4 | %) |  |  | 0.5 | % |  |  | (0.1 | %)
Domestic production deduction |  |  | 0.0 | % |  |  | (2.8 | %) |  |  | (2.9 | %)
Stock compensation |  |  | (4.8 | %) |  |  | (0.2 | %) |  |  | 0.1 | %
Non-deductible Section 162(m) compensation limitation |  |  | 4.3 | % |  |  | 0.7 | % |  |  | 0.3 | %
Foreign derived intangible income deduction |  |  | (1.3 | %) |  |  | 0.0 | % |  |  | 0.0 | %
Effective income tax rate |  |  | 19.3 | % |  |  | 31.1 | % |  |  | 36.0 | %

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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