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Segment Reporting (Details) (USD $) In Thousands, unless otherwise specified | Jan. 31, 2013 | Jan. 31, 2012 | Jan. 31, 2011
--- | --- | --- | ---
Financial information by business segment |  |  |
Fixed assets, net | $ 119,608 | $ 120,377 | $ 79,095
Intangible assets, net | 3,989 | 4,696 | 5,358
Goodwill | 4,320 | 4,320 | 4,320
Total Assets | 190,407 | 198,229 | 137,971
Equipment Leasing [Member] |  |  |
Financial information by business segment |  |  |
Fixed assets, net | 118,801 | 119,824 | 78,586
Intangible assets, net | 2,111 | 2,511 | 2,936
Total Assets | 171,971 | 175,930 | 118,929
Seamap [Member] |  |  |
Financial information by business segment |  |  |
Fixed assets, net | 807 | 553 | 509
Intangible assets, net | 1,878 | 2,185 | 2,422
Goodwill | 4,320 | 4,320 | 4,320
Total Assets | $ 18,578 | $ 22,630 | $ 19,569

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