CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Cash flows from operating activities:
Net income	$ 4,768	$ 17,051	$ 24,321
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	31,037	34,939	28,774
Stock-based compensation	1,143	1,586	1,331
Provision for doubtful accounts, net of charge offs	1,048	(428)	615
Provision for inventory obsolescence	(60)	163	173
Gross profit from sale of lease pool equipment	(4,556)	(5,369)	(4,923)
Excess tax benefit (expense) from exercise of non-qualified stock options and restricted shares	5	(420)	(778)
Deferred tax benefit	(2,204)	(4,450)	(285)
Changes in non-current income taxes payable	32	(5,059)	597
Changes in:
Trade accounts and contracts receivable	(9,142)	13,331	(16,687)
Inventories	(2,836)	718	(2,614)
Income taxes payable and receivable	3,215	(6,718)	2,532
Prepaid foreign income tax		3,519	(440)
Accounts payable, accrued expenses and other current liabilities	100	(4,091)	2,683
Prepaids and other current assets, net	(1,335)	(307)	(435)
Net cash provided by operating activities	21,215	44,257	35,958
Cash flows from investing activities:
Purchases of seismic equipment held for lease	(43,509)	(44,694)	(62,142)
Purchases of property and equipment	(549)	(965)	(1,525)
Sales of used lease pool equipment	6,851	11,412	6,503
Payment for earn-out provision		(450)	(148)
Net cash used in investing activities	(37,207)	(34,697)	(57,312)
Cash flows from financing activities:
Net proceeds from (payments on) revolving line of credit	18,000	(8,550)	(9,100)
Proceeds from equipment notes		147	37
Payments on borrowings	(136)	(1,532)	(3,308)
Net proceeds from (purchases of) short-term investment	652	(689)	(101)
Proceeds from issuance of common stock upon exercise of options	498	329	2,809
Purchase of treasury stock	(2,200)
Net proceeds from public offering of common stock			31,028
Excess tax benefit from exercise of non-qualified stock options	(5)	420	778
Net cash provided by (used in) financing activities	16,809	(9,875)	22,143
Effect of changes in foreign exchange rates on cash and cash equivalents	(805)	178	(149)
Net increase (decrease) in cash and cash equivalents	12	(137)	640
Cash and cash equivalents, beginning of year	15,150	15,287	14,647
Cash and cash equivalents, end of year	$ 15,162	$ 15,150	$ 15,287