Supplemental Statements of Cash Flows Information (Tables)

12 Months Ended

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