CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jul. 31, 2014	Jul. 31, 2013
Cash flows from operating activities:
Net income	$ 390	$ 5,614
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	18,545	15,624
Stock-based compensation	696	553
Provision for inventory obsolescence	44	58
Gross profit from sale of lease pool equipment	(1,563)	(2,058)
Excess tax benefit from exercise of non-qualified stock options and restricted shares	(123)	(44)
Deferred tax benefit	(2,009)	(695)
Changes in working capital items:
Accounts receivable	637	(2,568)
Contracts and notes receivable	122	1,329
Inventories	416	(1,028)
Prepaid expenses and other current assets	(2,239)	(1,382)
Income taxes payable	850	(1,666)
Accounts payable, accrued expenses, other current liabilities and deferred revenue	3,384	2,224
Net cash provided by operating activities	19,150	15,961
Cash flows from investing activities:
Purchases of seismic equipment held for lease	(13,716)	(7,829)
Acquisition of business	(14,500)
Purchases of property and equipment	(218)	(405)
Sale of used lease pool equipment	2,386	3,019
Net cash used in investing activities	(26,048)	(5,215)
Cash flows from financing activities:
Net proceeds from (payments on) revolving line of credit	3,000	(4,000)
Payments on borrowings	(67)	(72)
Net proceeds from short-term investments	85	7
Proceeds from issuance of common stock upon exercise of options	37	252
Purchase of treasury stock	(2,187)	(1,527)
Excess tax benefit from exercise of non-qualified stock options and restricted shares	123	44
Net cash provided by (used in) financing activities	991	(5,296)
Effect of changes in foreign exchange rates on cash and cash equivalents	172	(302)
Net change in cash and cash equivalents	(5,735)	5,148
Cash and cash equivalents, beginning of period	15,162	15,150
Cash and cash equivalents, end of period	9,427	20,298
Supplemental cash flow information:
Interest paid	392	82
Income taxes paid	1,376	3,625
Purchases of seismic equipment held for lease in accounts payable at end of period	$ 3,426	$ 1,190