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Segment Reporting (Details 1) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2013 | Oct. 31, 2012 | Jul. 31, 2012 | Apr. 30, 2012 | Jan. 31, 2012 | Oct. 31, 2011 | Jul. 31, 2011 | Apr. 30, 2011 | Jan. 31, 2013 | Jan. 31, 2012 | Jan. 31, 2011
Financial information by business segment |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 28,401,000 | $ 18,574,000 | $ 23,080,000 | $ 34,630,000 | $ 37,034,000 | $ 28,020,000 | $ 21,278,000 | $ 26,502,000 | $ 104,685,000 | $ 112,834,000 | $ 71,363,000
Interest income (expense), net |  |  |  |  |  |  |  |  | (378,000) | (214,000) | (127,000)
Income before taxes |  |  |  |  |  |  |  |  | 13,524,000 | 34,330,000 | 6,794,000
Capital expenditures |  |  |  |  |  |  |  |  | 45,659,000 | 63,667,000 | 33,119,000
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 34,939,000 | 28,774,000 | 22,717,000
Equipment Leasing [Member] |  |  |  |  |  |  |  |  |  |  |
Financial information by business segment |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 73,516,000 | 84,428,000 | 50,018,000
Interest income (expense), net |  |  |  |  |  |  |  |  | 11,000 | (397,000) | (470,000)
Income before taxes |  |  |  |  |  |  |  |  | 2,865,000 | 24,081,000 | 1,527,000
Capital expenditures |  |  |  |  |  |  |  |  | 45,181,000 | 63,198,000 | 32,876,000
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 34,320,000 | 28,215,000 | 22,120,000
Seamap [Member] |  |  |  |  |  |  |  |  |  |  |
Financial information by business segment |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 32,210,000 | 28,703,000 | 22,462,000
Interest income (expense), net |  |  |  |  |  |  |  |  |  | 1,000 | (3,000)
Income before taxes |  |  |  |  |  |  |  |  | 10,835,000 | 10,195,000 | 5,402,000
Capital expenditures |  |  |  |  |  |  |  |  | 478,000 | 469,000 | 243,000
Depreciation and amortization expense |  |  |  |  |  |  |  |  | $ 619,000 | $ 559,000 | $ 597,000

X
- Definition Total expenditures for additions to long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets of the reportable segment; if the amount: (a) is included in the determination of segment assets reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in the determination of segment assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 28 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The aggregate net amount of depreciation, amortization, and accretion recognized during an accounting period. As a noncash item, the net amount is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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- Definition Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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