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Unaudited Quarterly Financial Data (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
Unaudited Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 114,410,000 | $ 112,595,000 | $ 108,836,000 | $ 85,412,000 | $ 97,443,000 | $ 94,022,000 | $ 91,670,000 | $ 85,835,000 | $ 421,253,000 | $ 368,970,000 | $ 301,711,000
Cost of goods sold | 82,783,000 | 80,225,000 | 78,178,000 | 65,021,000 | 73,229,000 | 65,123,000 | 69,850,000 | 59,844,000 | 306,207,000 | 268,046,000 | 220,138,000
Gross profit | 31,627,000 | 32,370,000 | 30,658,000 | 20,391,000 | 24,214,000 | 28,899,000 | 21,820,000 | 25,991,000 | 115,046,000 | 100,924,000 | 81,573,000
Operating expenses [Abstract] |  |  |  |  |  |  |  |  |  |  |
General and administrative | 9,678,000 | 7,952,000 | 9,869,000 | 3,625,000 | 11,284,000 | 8,802,000 | 18,219,000 | 11,360,000 | 31,124,000 | 49,665,000 | 37,863,000
Sales and marketing | 3,551,000 | 3,234,000 | 2,707,000 | 2,634,000 | 2,382,000 | 2,671,000 | 2,632,000 | 2,280,000 | 12,126,000 | 9,965,000 | 7,851,000
Research and development | 1,011,000 | 1,039,000 | 905,000 | 869,000 | 915,000 | 711,000 | 646,000 | 736,000 | 3,824,000 | 3,008,000 | 2,273,000
Total operating expenses | 14,240,000 | 12,225,000 | 13,481,000 | 7,128,000 | 14,581,000 | 12,184,000 | 21,497,000 | 14,376,000 | 47,074,000 | 62,638,000 | 47,987,000
Operating income | 17,387,000 | 20,145,000 | 17,177,000 | 13,263,000 | 9,633,000 | 16,715,000 | 323,000 | 11,615,000 | 67,972,000 | 38,286,000 | 33,586,000
Other expense [Abstract] |  |  |  |  |  |  |  |  |  |  |
Interest expense, net | 3,729,000 | 3,357,000 | 3,189,000 | 2,819,000 | 2,678,000 | 2,516,000 | 2,613,000 | 8,437,000 | 13,094,000 | 16,244,000 | 13,065,000
Income before income tax expense | 13,658,000 | 16,788,000 | 13,988,000 | 10,444,000 | 6,955,000 | 14,199,000 | (2,290,000) | 3,178,000 | 54,878,000 | 22,042,000 | 20,521,000
Income tax expense (benefit) | 3,846,000 | 5,678,000 | 4,845,000 | 2,936,000 | 4,658,000 | 6,451,000 | (898,000) | 1,268,000 | 17,305,000 | 11,479,000 | 9,068,000
Net income | $ 9,812,000 | $ 11,110,000 | $ 9,143,000 | $ 7,508,000 | $ 2,297,000 | $ 7,748,000 | $ (1,392,000) | $ 1,910,000 | $ 37,573,000 | $ 10,563,000 | $ 11,453,000
Basic net income (loss) per share (in dollars per share) | $ 0.53 | $ 0.59 | $ 0.49 | $ 0.40 | $ 0.12 | $ 0.42 | $ (0.08) | $ 0.11 | $ 2.02 | $ 0.58 | $ 0.68
Diluted net income (loss) per share (in dollars per share) | $ 0.50 | $ 0.57 | $ 0.47 | $ 0.39 | $ 0.12 | $ 0.41 | $ (0.08) | $ 0.10 | $ 1.93 | $ 0.55 | $ 0.65

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