Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data	3 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Consolidated Statements of Operations [Abstract]
Net revenues	$ 51,524	$ 67,155
Costs and expenses:
Cost of sales	45,595	57,523
Other operating costs and expenses	387	299
Selling, general and administrative expenses	1,689	1,929
Total costs and expenses	47,671	59,751
Operating income	3,853	7,404
Interest income, net	31	10
Realized gain on sale of marketable security	828
Income before income taxes	4,712	7,414
Provision for income taxes	1,375	1,535
Net income	$ 3,337	$ 5,879
Net income per share:
Basic	$ 0.12	$ 0.22
Diluted	$ 0.12	$ 0.22
Weighted average shares outstanding:
Basic	27,130	27,130
Diluted	27,130	27,131