Consolidated Statements of Stockholders' Equity and Redeemable Noncontrolling Interest (USD $) In Thousands, except Share data	Total	Common Stock	Additional paid-in capital	Retained earnings	Accumulated other comprehensive income	Redeemable noncontrolling interest
Beginning balance at Mar. 31, 2009	$ 148,040	$ 65	$ 126,045	$ 21,930	$ 0	$ 0
Beginning balance, shares at Mar. 31, 2009		6,506,843
Net income (loss)	(3,371)			(3,371)		(422)
Stock option exercises and associated tax benefits, shares		34,841
Stock option exercises and associated tax benefits	735		735
Stock-based compensation	372		372
Capital contribution						35,000
Ending balance at Mar. 31, 2010	145,776	65	127,152	18,559	0	34,578
Ending balance, shares at Mar. 31, 2010		6,541,684
Net income (loss)	2,831			2,831		1,241
Stock option exercises and associated tax benefits, shares		275,922
Stock option exercises and associated tax benefits	1,391	3	1,388
Stock-based compensation	671		671
Ending balance at Mar. 31, 2011	150,669	68	129,211	21,390	0	35,819
Ending balance, shares at Mar. 31, 2011	6,817,606	6,817,606
Net income (loss)	15,237			15,237		14,491
Other comprehensive income	58				58	58
Total comprehensive income	15,295					14,549
Stock option exercises and associated tax benefits, shares		73,190
Stock option exercises and associated tax benefits	1,463	1	1,462
Stock-based compensation	916		916
Capital contribution						36,173
Ending balance at Mar. 31, 2012	$ 168,343	$ 69	$ 131,589	$ 36,627	$ 58	$ 86,541
Ending balance, shares at Mar. 31, 2012	6,890,796	6,890,796