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Consolidated Statements of Operations (Unaudited) - USD ($)
 3 Months Ended 6 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Consolidated Statements of Operations (Unaudited) [Abstract]        
Net sales $ 111,774,000 $ 108,836,000 $ 206,837,000 $ 194,248,000
Cost of goods sold 84,612,000 78,178,000 153,836,000 143,199,000
Gross profit 27,162,000 30,658,000 53,001,000 51,049,000
Operating expenses:        
General and administrative 8,615,000 9,869,000 14,802,000 13,494,000
Sales and marketing 3,457,000 2,707,000 6,851,000 5,341,000
Research and development 1,240,000 905,000 2,242,000 1,774,000
Total operating expenses 13,312,000 13,481,000 23,895,000 20,609,000
Operating income 13,850,000 17,177,000 29,106,000 30,440,000
Interest expense, net 3,522,000 3,189,000 6,836,000 6,008,000
Income before income tax expense 10,328,000 13,988,000 22,270,000 24,432,000
Income tax expense 4,027,000 4,845,000 8,343,000 7,781,000
Net income $ 6,301,000 $ 9,143,000 $ 13,927,000 $ 16,651,000
Basic net income per share (in dollars per share) $ 0.34 $ 0.49 $ 0.75 $ 0.90
Diluted net income per share (in dollars per share) $ 0.33 $ 0.47 $ 0.72 $ 0.86
Weighted average number of shares outstanding:        
Basic (in shares) 18,718,709 18,641,324 18,687,179 18,544,118
Diluted (in shares) 19,356,809 19,429,390 19,371,144 19,384,668