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Significant accounting policies Inventories (Tables) | 12 Months Ended
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Jan. 31, 2013
Inventories [Abstract] |
Schedule of Inventory, Current [Table Text Block] |
| 2012 |  | 2011 |
Raw materials | $35,145 | $33,402
Work in process | 3,506 |  | 2,927 |
Finished goods | 4,476 |  | 4,715 |
Subtotal | 43,127 |  | 41,044 |
Less allowances | 794 |  | 840 |
Inventories, net | $42,333 | $40,204

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- Definition Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 2 -Paragraph 6 -Subparagraph a,b,c -Article 5 + Details
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