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Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified | Dec. 31, 2013 | Mar. 31, 2013
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Statement Of Financial Position [Abstract] |  |
Allowances on trade accounts receivable | $ 48 | $ 33
Preferred stock, par value | $ 1.00 | $ 1.00
Preferred stock, shares authorized | 500 | 500
Common stock, par value | $ 0.10 | $ 0.10
Common stock, shares authorized | 25,500 | 25,500
Common stock, shares issued | 10,390 | 10,331
Treasury stock, shares | 317 | 327

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