Condensed Consolidated Balance Sheets ( December 31, 2012 Unaudited) (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2012	Mar. 31, 2012
Accounts receivable, allowance for doubtful accounts (in Dollars) (in Dollars) (in Dollars) (in Dollars)	$ 790	$ 781
Property, plant and equipment, accumulated depreciation (in Dollars)	$ 36,911	$ 35,309
Common stock, shares authorized (in Shares) (in Shares) (in Shares)	40,000,000	40,000,000
Common stock, par value (in Dollars per share) (in Dollars per share) (in Dollars per share) (in Dollars per share)	$ 0.001	$ 0.001
Common stock, shares issued (in Shares) (in Shares) (in Shares)	16,390,628	16,390,628
Common stock, shares outstanding (in Shares) (in Shares) (in Shares)	16,390,628	16,390,628