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SELECTED QUARTERLY INFORMATION (Tables) | 12 Months Ended
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Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information [Table Text Block] | The following tables set forth certain data from the Company's consolidated statements of income for each of the quarters in the years ended December 31, 2016 and 2015. The unaudited quarterly consolidated financial statements have been prepared on the same basis as the audited consolidated financial statements contained herein and include all adjustments that the Company considers necessary for a fair presentation of such information when read in conjunction with the Company's annual audited consolidated financial statements and notes thereto appearing elsewhere in this report. The operating results for any quarter are not necessarily indicative of the results for any subsequent period or for the entire fiscal year.
| Three Months Ended
| (unaudited)
| Dec. 31, |  | Sept. 30, |  | June 30, |  | Mar. 31, |  | Dec. 31, |  | Sept. 30, |  | June 30, |  | Mar. 31,
(in thousands, except per share data) | 2016 |  | 2016 |  | 2016 |  | 2016 |  | 2015 |  | 2015 |  | 2015 |  | 2015
Net revenues | $ | 101,108 |  |  | $ | 103,790 |  |  | $ | 97,169 |  |  | $ | 85,326 |  |  | $ | 87,289 |  |  | $ | 88,878 |  |  | $ | 85,265 |  |  | $ | 82,557 |
Gross profit | $ | 49,384 |  |  | $ | 51,193 |  |  | $ | 47,637 |  |  | $ | 42,947 |  |  | $ | 42,916 |  |  | $ | 44,161 |  |  | $ | 44,018 |  |  | $ | 42,292 |
Net income | $ | 13,617 |  |  | $ | 14,165 |  |  | $ | 11,265 |  |  | $ | 8,843 |  |  | $ | 12,701 |  |  | $ | 11,513 |  |  | $ | 8,590 |  |  | $ | 6,343 |
Earnings per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic | $ | 0.47 |  |  | $ | 0.49 |  |  | $ | 0.39 |  |  | $ | 0.31 |  |  | $ | 0.45 |  |  | $ | 0.40 |  |  | $ | 0.29 |  |  | $ | 0.22 |
Diluted | $ | 0.46 |  |  | $ | 0.48 |  |  | $ | 0.38 |  |  | $ | 0.30 |  |  | $ | 0.44 |  |  | $ | 0.39 |  |  | $ | 0.29 |  |  | $ | 0.21 |
Shares used in per share calculation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic | 29,196 |  |  | 28,972 |  |  | 28,850 |  |  | 28,679 |  |  | 28,483 |  |  | 28,855 |  |  | 29,368 |  |  | 29,309 |
Diluted | 29,914 |  |  | 29,625 |  |  | 29,422 |  |  | 29,244 |  |  | 29,126 |  |  | 29,298 |  |  | 30,034 |  |  | 30,058 |

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=68076893&loc=d3e1280-108306 + Details
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