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Significant accounting policies Investment in joint venture (Details) (USD $) | 12 Months Ended
--- | ---
Jan. 31, 2013 | Jan. 31, 2012
Schedule of Equity Method Investments [Line Items] |  |
Equity Method Investment, Summarized Financial Information, Current Assets | $ 14,058,000 | $ 14,381,000
Equity Method Investment, Summarized Financial Information, Noncurrent Assets | 19,442,000 | 14,259,000
date of investment in joint venture | Oct. 18, 2009 |
Income (Loss) from Equity Method Investments | 1,386,000 | 1,558,000
Equity Method Investment, Aggregate Cost | 5,900,000 |
Payments to Acquire Interest in Joint Venture | 2,000,000 |
Equity Method Investment, Ownership Percentage | 49.00% |
Advances to Affiliate | 3,900,000 |
Payments to Fund Long-term Loans to Related Parties | 989,000 | 0
Equity Method Investment, Summarized Financial Information, Current Liabilities | 2,703,000 | 3,449,000
Equity Method Investment, Summarized Financial Information, Noncurrent Liabilities | 18,274,000 | 15,403,000
Equity Method Investment, Summarized Financial Information, Equity or Capital | 12,524,000 | 9,789,000
Equity Method Investment, Summarized Financial Information, Revenue | 30,448,000 | 29,010,000
Equity Method Investment, Summarized Financial Information, Gross Profit (Loss) | 7,211,000 | 7,565,000
Equity Method Investment, Summarized Financial Information, Income (Loss) from Continuing Operations before Extraordinary Items | 3,380,000 | 5,137,000
Equity Method Investment, Summarized Financial Information, Net Income (Loss) | 2,680,000 | 3,189,000
loan to joint venture | $ (1,000,000) |

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- Definition The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 cash outflow associated with extending a long-term loan to a related party. Alternate caption: Payments for Advances to Affiliates. + References No definition available. + Details
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