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Supplemental Statements of Cash Flows Information (Tables) | 12 Months Ended
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Jan. 31, 2013
Supplemental Statements of Cash Flows Information [Abstract] |
Supplemental disclosures of cash flows information |
|  | Years Ended January 31, |
|  | 2013 |  |  | 2012 |  |  | 2011 |
Interest paid |  | $ | 533 |  |  | $ | 704 |  |  | $ | 728 |
Income taxes paid, net |  |  | 9,177 |  |  |  | 7,536 |  |  |  | 508 |
Seismic equipment purchases included in accounts payable at year-end |  |  | 4,268 |  |  |  | 9,900 |  |  |  | 3,229 |
Stock issued for accrued compensation |  |  | 516 |  |  |  | 303 |  |  |  | 185 |

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- Definition Tabular disclosure of supplemental cash flow information for the periods presented. + References No definition available. + Details
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