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Consolidated Statements of Operations (Unaudited) - USD ($)
 3 Months Ended 6 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Consolidated Statements of Operations (Unaudited) [Abstract]        
Net sales $ 108,836,000 $ 91,670,000 $ 194,248,000 $ 177,505,000
Cost of goods sold 78,178,000 69,850,000 143,199,000 129,694,000
Gross profit 30,658,000 21,820,000 51,049,000 47,811,000
Operating expenses:        
General and administrative 9,869,000 18,219,000 13,494,000 29,579,000
Sales and marketing 2,707,000 2,632,000 5,341,000 4,912,000
Research and development 905,000 646,000 1,774,000 1,382,000
Total operating expenses 13,481,000 21,497,000 20,609,000 35,873,000
Operating income 17,177,000 323,000 30,440,000 11,938,000
Interest expense, net 3,189,000 2,613,000 6,008,000 11,050,000
Income (loss) before income tax expense (benefit) 13,988,000 (2,290,000) 24,432,000 888,000
Income tax expense (benefit) 4,845,000 (898,000) 7,781,000 370,000
Net income (loss) $ 9,143,000 $ (1,392,000) $ 16,651,000 $ 518,000
Basic net income (loss) per share (in dollars per share) $ 0.49 $ (0.08) $ 0.90 $ 0.03
Diluted net income (loss) per share (in dollars per share) $ 0.47 $ (0.08) $ 0.86 $ 0.03
Weighted average number of shares outstanding:        
Basic (in shares) 18,641,324 18,215,783 18,544,118 18,109,912
Diluted (in shares) 19,429,390 18,215,783 19,384,668 18,887,153