Consolidated Statements of Shareholder's Equity (USD $) In Thousands, except Share data	Common Stock [Member]	Retained Earnings [Member]	Total
Balance at March 31, 2011 at Mar. 31, 2010	$ 13,539	$ (652)	$ 12,887
Balance at March 31, 2011 (in Shares) at Mar. 31, 2010	11,641,903
Balance at March 31, 2010			22,207
Issuance of common stock under stock plans	5		5
Issuance of common stock under stock plans (in Shares)	4,000
Cash dividends		(16,305)	(16,305)
Net income		25,620	25,620
Balance at March 31, 2011 at Mar. 31, 2011			$ 22,207