Condensed Consolidated Balance Sheet (Parenthetical) (Unaudited) (USD $) In Thousands, except Share data	Jun. 30, 2011	Mar. 31, 2011
Balance Sheet (Parenthetical)
Trade receivables, less allowance for doubtful accounts	$ 787	$ 754
Preferred stock, par value (in dollars per share)	$ 0.025	$ 0.025
Preferred stock, shares authorized (in shares)	16,000	16,000
Preferred stock, shares, issued (in shares)	0	0
Common stock, par value (in dollars per shares)	$ 0.625	$ 0.625
Common stock, Shares authorized (in shares)	80,000	80,000
Common stock, shares issued ( in shares)	47,119	47,105
Treasury stock at cost: shares (in shares)	575	559