Condensed Consolidated Balance Sheets (Unaudited) (USD $)	Apr. 30, 2013	Jan. 31, 2013
Current assets:
Cash and cash equivalents	$ 16,544,000	$ 15,150,000
Restricted cash	775,000	801,000
Accounts receivable, net	28,416,000	23,131,000
Current portion of contracts and notes receivable	1,638,000	2,096,000
Inventories, net	7,445,000	6,188,000
Prepaid income taxes	5,528,000	5,591,000
Deferred tax asset	1,900,000	1,842,000
Prepaid expenses and other current assets	4,619,000	3,079,000
Total current assets	66,865,000	57,878,000
Seismic equipment lease pool and property and equipment, net	111,829,000	119,608,000
Intangible assets, net	3,815,000	3,989,000
Goodwill	4,320,000	4,320,000
Deferred tax asset	3,919,000	4,296,000
Other assets	87,000	316,000
Total assets	190,835,000	190,407,000
Current liabilities:
Accounts payable	3,599,000	6,921,000
Current maturities - long-term debt	147,000	145,000
Deferred revenue	1,134,000	539,000
Accrued expenses and other current liabilities	3,486,000	1,875,000
Total current liabilities	8,366,000	9,480,000
Non-current income taxes payable	376,000	376,000
Long-term debt, net of current maturities	2,199,000	4,238,000
Total liabilities	10,941,000	14,094,000
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; 13,783 and 13,763 shares issued at April 30, 2013 and January 31, 2013, respectively	138,000	138,000
Additional paid-in capital	116,888,000	116,506,000
Treasury stock, at cost (1,029 and 926 shares at April 30, 2013 and January 31, 2013, respectively)	(6,387,000)	(4,860,000)
Retained earnings	62,655,000	56,348,000
Accumulated other comprehensive income	6,600,000	8,181,000
Total shareholders' equity	179,894,000	176,313,000
Total liabilities and shareholders' equity	$ 190,835,000	$ 190,407,000