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Note 6 - Net Income Per Share (Tables) | 3 Months Ended
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Mar. 31, 2015
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three Months Ended March 31, |
|  | 2015 |  |  | 2014 |
Numerator: |  |  |  |  |  |  |  |
Net income |  | $ | 5,967 |  |  | $ | 6,255 |
Denominator: |  |  |  |  |  |  |  |
Basic weighted-average shares outstanding |  |  | 31,336 |  |  |  | 30,477 |
Effect of dilutive options and restricted stock |  |  | 955 |  |  |  | 1,488 |
Diluted weighted average shares outstanding |  |  | 32,291 |  |  |  | 31,965 |
Net income per share - Basic |  | $ | 0.19 |  |  | $ | 0.21 |
Net income per share - Diluted |  | $ | 0.18 |  |  | $ | 0.20 |
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] |
|  | Three Months Ended March 31, |
|  | 2015 |  |  | 2014 |
Outstanding options |  |  | 55 |  |  |  | 19 |
Nonvested restricted stock units |  |  | 414 |  |  |  | — |
Employee Stock Purchase Plan |  |  | 264 |  |  |  | 48 |
Total |  |  | 733 |  |  |  | 67 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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