CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 30, 2014	Apr. 30, 2013
Cash flows from operating activities:
Net income	$ 3,737	$ 6,307
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	9,082	7,826
Stock-based compensation	399	266
Provision for inventory obsolescence	20	58
Gross profit from sale of lease pool equipment	(707)	(498)
Excess tax benefit from exercise of non-qualified stock options and restricted shares		(56)
Deferred tax (benefit) provision	(801)	259
Changes in working capital items:
Accounts receivable	404	(5,665)
Contracts and notes receivable	64	688
Inventories	175	(1,345)
Prepaid expenses and other current assets	1,343	(1,578)
Income taxes payable	378	(46)
Accounts payable, accrued expenses, other current liabilities and deferred revenue	(36)	2,174
Net cash provided by operating activities	14,058	8,390
Cash flows from investing activities:
Purchases of seismic equipment held for lease	(9,129)	(4,945)
Purchases of property and equipment	(87)	(161)
Sale of used lease pool equipment	1,101	900
Net cash used in investing activities	(8,115)	(4,206)
Cash flows from financing activities:
Net payments on revolving line of credit	(7,000)	(2,000)
Payments on borrowings	(34)	(39)
Net proceed from short-term investments	85	3
Proceeds from issuance of common stock upon exercise of options	36	60
Purchase of treasury stock	(2,173)	(1,527)
Excess tax benefit from exercise of non-qualified stock options and restricted shares		56
Net cash used in financing activities	(9,086)	(3,447)
Effect of changes in foreign exchange rates on cash and cash equivalents	(338)	657
Net change in cash and cash equivalents	(3,481)	1,394
Cash and cash equivalents, beginning of period	15,162	15,150
Cash and cash equivalents, end of period	11,681	16,544
Supplemental cash flow information:
Interest paid	136	66
Income taxes paid, net	1,555	1,379
Purchases of seismic equipment held for lease in accounts payable at end of period	$ 1,361	$ 995