Consolidated Statements of Operations (Unaudited) (USD $)	3 Months Ended		6 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Consolidated Statements of Operations (Unaudited) [Abstract]
Net sales	$ 66,174,000	$ 57,652,000	$ 116,419,000	$ 104,451,000
Cost of goods sold	46,469,000	37,556,000	80,700,000	69,536,000
Gross profit	19,705,000	20,096,000	35,719,000	34,915,000
Operating expenses:
General and administrative	8,706,000	4,392,000	18,338,000	10,306,000
Sales and marketing	2,143,000	1,724,000	3,874,000	3,496,000
Research and development	398,000	461,000	947,000	897,000
Total operating expenses	11,247,000	6,577,000	23,159,000	14,699,000
Operating income	8,458,000	13,519,000	12,560,000	20,216,000
Interest expense, net	4,663,000	3,093,000	8,588,000	5,989,000
Income from continuing operations before income tax expense	3,795,000	10,426,000	3,972,000	14,227,000
Income tax expense	1,631,000	3,923,000	1,705,000	5,357,000
Income from continuing operations	2,164,000	6,503,000	2,267,000	8,870,000
Income (loss) from discontinued operations	0	(15,436,000)	100,877,000	(27,665,000)
Net income (loss)	$ 2,164,000	$ (8,933,000)	$ 103,144,000	$ (18,795,000)
Basic net income per share from continuing operations (in dollars per share)	$ 0.15	$ 0.45	$ 0.16	$ 0.63
Basic net income (loss) per share from discontinued operations (in dollars per share)	$ 0	$ (1.07)	$ 6.97	$ (1.95)
Basic net income (loss) per share (in dollars per share)	$ 0.15	$ (0.62)	$ 7.13	$ (1.32)
Diluted net income per share from continuing operations (in dollars per share)	$ 0.15	$ 0.45	$ 0.16	$ 0.62
Diluted net income (loss) per share from discontinued operations (in dollars per share)	$ 0	$ (1.07)	$ 6.90	$ (1.94)
Diluted net income (loss) per share (in dollars per share)	$ 0.15	$ (0.62)	$ 7.06	$ (1.32)
Weighted average number of shares outstanding:
Basic (in shares)	14,460,979	14,456,921	14,460,979	14,192,235
Diluted (in shares)	14,554,457	14,501,152	14,612,288	14,248,715