Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Consolidated Statements of Operations [Abstract]
Net revenues	$ 41,380	$ 51,966	$ 92,904	$ 119,121
Costs and expenses:
Cost of sales	37,005	45,892	82,600	103,415
Other operating costs and expenses	302	712	689	1,011
Selling, general and administrative expenses	2,380	2,045	4,069	3,974
Total costs and expenses	39,687	48,649	87,358	108,400
Operating income	1,693	3,317	5,546	10,721
Interest (expense) income, net	(1)	4	30	14
Realized gain on sale of marketable security			828
Income before income taxes	1,692	3,321	6,404	10,735
(Benefit) provision for income taxes	(71)	98	1,304	1,633
Net income	$ 1,763	$ 3,223	$ 5,100	$ 9,102
Net income per share:
Basic	$ 0.06	$ 0.12	$ 0.19	$ 0.34
Diluted	$ 0.06	$ 0.12	$ 0.19	$ 0.34
Weighted average shares outstanding:
Basic	27,130	27,130	27,130	27,130
Diluted	27,130	27,131	27,130	27,131