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Consolidated Statements of Operations (Unaudited) (USD $)
 3 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Consolidated Statements of Operations (Unaudited) [Abstract]    
Net sales $ 50,245,000 $ 46,799,000
Cost of goods sold 34,231,000 31,980,000
Gross profit 16,014,000 14,819,000
Operating expenses:    
General and administrative 9,632,000 5,914,000
Sales and marketing 1,731,000 1,772,000
Research and development 549,000 436,000
Total operating expenses 11,912,000 8,122,000
Operating income 4,102,000 6,697,000
Interest expense, net 3,925,000 2,896,000
Income from continuing operations before income tax expense 177,000 3,801,000
Income tax expense 74,000 1,434,000
Income from continuing operations 103,000 2,367,000
Income (loss) from discontinued operations 100,877,000 (12,229,000)
Net income (loss) $ 100,980,000 $ (9,862,000)
Basic net income per share from continuing operations (in dollars per share) $ 0.01 $ 0.17
Basic net income (loss) per share from discontinued operations (in dollars per share) $ 6.97 $ (0.88)
Basic net income (loss) per share (in dollars per share) $ 6.98 $ (0.71)
Diluted net income per share from continuing operations (in dollars per share) $ 0.01 $ 0.17
Diluted net income (loss) per share from discontinued operations (in dollars per share) $ 6.93 $ (0.87)
Diluted net income (loss) per share (in dollars per share) $ 6.94 $ (0.70)
Weighted average number of shares outstanding:    
Basic (in shares) 14,460,979 13,924,641
Diluted (in shares) 14,547,565 14,012,683