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Revenue Recognition, Consolidated Statement of Operations (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Consolidated Statement of Operations [Abstract]            
Net sales $ 124,113,000 $ 102,878,000 $ 343,720,000 $ 307,834,000    
Cost of goods sold 102,952,000 76,817,000 280,496,000 229,894,000    
Gross profit 21,161,000 26,061,000 63,224,000 77,940,000    
Operating expenses [Abstract]            
General and administrative 12,331,000 11,915,000 33,419,000 26,418,000    
Sales and marketing 5,149,000 4,048,000 14,078,000 10,899,000    
Research and development 2,054,000 1,678,000 5,574,000 3,920,000    
Total operating expenses 19,534,000 17,641,000 53,071,000 41,237,000    
Operating income 1,627,000 8,420,000 10,153,000 36,703,000    
Interest expense, net 5,764,000 3,953,000 16,538,000 10,789,000    
(Loss) income before income tax (benefit) expense (4,137,000) 4,467,000 (6,385,000) 25,914,000    
Income tax expense (1,035,000) 6,994,000 (1,301,000) 15,026,000    
Net (loss) income $ (3,102,000) $ (2,527,000) $ (5,084,000) $ 10,888,000    
Basic net (loss) income per share (in dollars per share) $ (0.16) $ (0.13) $ (0.27) $ 0.58    
Diluted net (loss) income per share (in dollars per share) $ (0.16) $ (0.13) $ (0.27) $ 0.56    
Weighted average number of shares outstanding [Abstract]            
Basic (in shares) 18,810,702 19,069,152 18,861,617 18,814,967    
Diluted (in shares) 18,810,702 19,069,152 18,861,617 19,400,744    
As Revised [Member] | ASC 606 [Member]            
Consolidated Statement of Operations [Abstract]            
Net sales   $ 101,713,000   $ 306,805,000    
Cost of goods sold   75,833,000   229,669,000    
Gross profit   25,880,000   77,136,000    
Operating expenses [Abstract]            
General and administrative   11,915,000   26,418,000    
Sales and marketing   4,048,000   10,899,000    
Research and development   1,678,000   3,920,000    
Total operating expenses   17,641,000   41,237,000    
Operating income   8,239,000   35,899,000    
Interest expense, net   3,953,000   10,789,000    
(Loss) income before income tax (benefit) expense   4,286,000   25,110,000    
Income tax expense   6,936,000   14,742,000    
Net (loss) income   $ (2,650,000)   $ 10,368,000    
Basic net (loss) income per share (in dollars per share)   $ (0.14)   $ 0.55    
Diluted net (loss) income per share (in dollars per share)   $ (0.14)   $ 0.53    
Weighted average number of shares outstanding [Abstract]            
Basic (in shares)   19,069,152   18,814,967    
Diluted (in shares)   19,069,152   19,400,744    
Adoption of ASC 606 [Member] | ASC 606 [Member]            
Consolidated Statement of Operations [Abstract]            
Net sales   $ 1,165,000   $ 1,029,000 $ 557,000 $ (824,000)
Cost of goods sold   984,000   225,000 $ 66,000 $ (758,000)
Gross profit   181,000   804,000    
Operating expenses [Abstract]            
General and administrative   0   0    
Sales and marketing   0   0    
Research and development   0   0    
Total operating expenses   0   0    
Operating income   181,000   804,000    
Interest expense, net   0   0    
(Loss) income before income tax (benefit) expense   181,000   804,000    
Income tax expense   58,000   284,000    
Net (loss) income   $ 123,000   $ 520,000    
Basic net (loss) income per share (in dollars per share)   $ 0.01   $ 0.03    
Diluted net (loss) income per share (in dollars per share)   $ 0.01   $ 0.03    
Weighted average number of shares outstanding [Abstract]            
Basic (in shares)   19,069,152   18,814,967    
Diluted (in shares)   19,069,152   19,400,744