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Consolidated Statements of Operations (Unaudited) - USD ($)
 3 Months Ended 9 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Consolidated Statements of Operations (Unaudited) [Abstract]        
Net sales $ 100,127,000 $ 112,595,000 $ 306,964,000 $ 306,843,000
Cost of goods sold 77,583,000 80,225,000 231,419,000 223,424,000
Gross profit 22,544,000 32,370,000 75,545,000 83,419,000
Operating expenses:        
General and administrative 11,915,000 7,952,000 26,717,000 21,446,000
Sales and marketing 4,048,000 3,234,000 10,899,000 8,575,000
Research and development 1,678,000 1,039,000 3,920,000 2,813,000
Total operating expenses 17,641,000 12,225,000 41,536,000 32,834,000
Operating income 4,903,000 20,145,000 34,009,000 50,585,000
Interest expense, net 3,953,000 3,357,000 10,789,000 9,365,000
Income before income tax expense 950,000 16,788,000 23,220,000 41,220,000
Income tax expense 7,756,000 5,678,000 16,099,000 13,459,000
Net (loss) income $ (6,806,000) $ 11,110,000 $ 7,121,000 $ 27,761,000
Basic net (loss) income per share (in dollars per share) $ (0.36) $ 0.59 $ 0.38 $ 1.49
Diluted net (loss) income per share (in dollars per share) $ (0.36) $ 0.57 $ 0.37 $ 1.43
Weighted average number of shares outstanding:        
Basic (in shares) 19,069,152 18,675,125 18,814,967 18,587,946
Diluted (in shares) 19,069,152 19,441,265 19,400,744 19,399,857