Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2012	Mar. 31, 2012
Statement of Financial Position [Abstract]
Accounts and notes receivable, allowances for doubtful accounts	$ 712	$ 649
Property and equipment, accumulated depreciation	18,868	17,032
Other intangible assets, accumulated amortization	$ 2,213	$ 1,579
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	10,000	10,000
Preferred stock, shares issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	30,000	30,000
Common stock, shares issued (in shares)	11,844	11,078
Common stock, shares outstanding (in shares)	11,844	11,078