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Note 20 - Selected Quarterly Financial Data (Unaudited) - Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | [1] | Dec. 31, 2016 | [1]
Net Revenues | $ 85,612 | $ 83,519 | $ 81,087 | $ 95,795 | $ 90,621 | $ 85,008 | $ 84,223 | $ 69,568 | $ 346,013 | $ 329,421 |  | $ 189,819 |
Gross Profit | 27,731 | 24,262 | 22,158 | 22,619 | 25,736 | 20,494 | 21,347 | 16,944 | 96,770 | 84,521 |  | 63,054 |
Net income | $ 4,436 | $ 5,347 | $ 3,608 | $ 3,744 | $ 11,199 | $ 3,439 | $ 5,241 | $ 2,446 | $ 17,135 | $ 22,327 | [2] | $ 16,067 | [2]
Basic (in dollars per share) | $ 0.42 | $ 0.50 | $ 0.34 | $ 0.35 | $ 1.06 | $ 0.33 | $ 0.50 | $ 0.23 | $ 1.62 | $ 2.12 |  | $ 1.53 |
Diluted (in dollars per share) | $ 0.41 | $ 0.50 | $ 0.33 | $ 0.35 | $ 1.04 | $ 0.32 | $ 0.49 | $ 0.23 | $ 1.59 | $ 2.07 |  | $ 1.50 |
[1] | The Company has initially applied ASC 2014-09 (Topic 606) using the modified retrospective method. Under this method, the comparative information is not restated.
[2] | The Company has initially applied ASC 2014-09 (Topic 606) using the modified retrospective method. Under this method, the comparative information is not restated.

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