Segment Reporting (Details) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2012	Jan. 31, 2012
Segment Reporting Information [Line Items]
Total Assets	$ 193,721	$ 198,229
Equipment Leasing [Member]
Segment Reporting Information [Line Items]
Total Assets	174,698	172,238
Seamap [Member]
Segment Reporting Information [Line Items]
Total Assets	19,217	26,322
Eliminations [Member]
Segment Reporting Information [Line Items]
Total Assets	$ (194)	$ (331)