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Consolidated Statements of Operations (Unaudited) - USD ($)
 3 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Consolidated Statements of Operations (Unaudited) [Abstract]    
Net sales $ 95,063,000 $ 85,412,000
Cost of goods sold 69,224,000 65,021,000
Gross profit 25,839,000 20,391,000
Operating expenses:    
General and administrative 6,187,000 3,625,000
Sales and marketing 3,394,000 2,634,000
Research and development 1,002,000 869,000
Total operating expenses 10,583,000 7,128,000
Operating income 15,256,000 13,263,000
Interest expense, net 3,314,000 2,819,000
Income before income tax expense 11,942,000 10,444,000
Income tax expense 4,316,000 2,936,000
Net income $ 7,626,000 $ 7,508,000
Basic net income per share (in dollars per share) $ 0.41 $ 0.40
Diluted net income per share (in dollars per share) $ 0.39 $ 0.39
Weighted average number of shares outstanding:    
Basic (in shares) 18,655,304 18,545,621
Diluted (in shares) 19,421,352 19,484,938