Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2013	Mar. 31, 2013
Statement of Financial Position [Abstract]
Accounts and notes receivable, allowances for doubtful accounts	$ 828	$ 866
Property and equipment, accumulated depreciation	21,109	19,925
Other intangible assets, accumulated amortization	$ 2,559	$ 2,343
Preferred stock, par value (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 (per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	30,000	30,000
Common stock, shares issued (in shares)	11,897	11,892
Common stock, shares outstanding (in shares)	11,897	11,892