Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jan. 31, 2013	Jan. 31, 2012
Current assets:
Cash and cash equivalents	$ 15,150	$ 15,287
Restricted cash	801	98
Accounts receivable, net of allowance for doubtful accounts of $3,374 and $4,391 at January 31, 2013 and 2012, respectively	23,131	35,788
Current portion of contracts and notes receivable	2,096	2,273
Inventories, net	6,188	6,708
Prepaid income taxes	5,591
Deferred tax asset	1,842	2,594
Prepaid expenses and other current assets	3,079	2,530
Total current assets	57,878	65,278
Seismic equipment lease pool and property and equipment, net	119,608	120,377
Intangible assets, net	3,989	4,696
Goodwill	4,320	4,320
Prepaid foreign income tax		3,519
Deferred tax asset	4,296
Other assets	316	39
Total assets	190,407	198,229
Current liabilities:
Accounts payable	6,921	13,037
Current maturities - long-term debt	145	1,399
Income taxes payable		2,419
Deferred revenue	539	543
Accrued expenses and other current liabilities	1,875	6,583
Total current liabilities	9,480	23,981
Non-current income taxes payable	376	5,435
Deferred tax liability		595
Long-term debt, net of current maturities	4,238	12,784
Total liabilities	14,094	42,795
Commitments and contingencies (Note 12, 16 and 17)
Shareholders' equity:
Preferred stock, $1.00 par value; 1,000 shares authorized; none issued and outstanding
Common stock, $0.01 par value; 20,000 shares authorized; 13,763 and 13,556 shares issued at January 31, 2013 and January 31, 2012, respectively	138	136
Additional paid-in capital	116,506	113,654
Treasury stock, at cost (926 and 925 shares at January 31, 2013 and 2012, respectively)	(4,860)	(4,857)
Retained earnings	56,348	39,297
Accumulated other comprehensive income	8,181	7,204
Total shareholders' equity	176,313	155,434
Total liabilities and shareholders' equity	$ 190,407	$ 198,229