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Investment in joint venture (Details) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Oct. 31, 2013 | Oct. 31, 2012 | Oct. 31, 2013 | Oct. 31, 2012 | Jan. 31, 2013
Investment in joint venture [Line Items] |  |  |  |  |
date of investment in joint venture |  |  | Oct. 18, 2009 |  |
initial investment in joint venture |  |  | $ 5,900,000 |  |
Payment to acquire interest in joint venture |  |  | 2,000,000 |  |
Joint venture ownership percentage | 49.00% |  | 49.00% |  |
Advance to joint venture |  |  | 3,900,000 |  |
Loan to joint venture | 1,000,000 |  | 1,000,000 |  |
Income from joint venture | 715,000 | 531,000 | 248,000 | 354,000 |
Current assets | 12,312,000 |  | 12,312,000 |  | 14,058,000
Noncurrent assets | 18,613,000 |  | 18,613,000 |  | 19,442,000
Current liabilities | 2,306,000 |  | 2,306,000 |  | 2,703,000
Noncurrent liabilities | 15,989,000 |  | 15,989,000 |  | 18,274,000
Equity | 12,630,000 |  | 12,630,000 |  | 12,524,000
Revenue |  |  | 19,913,000 | 19,389,000 |
Gross profit |  |  | 3,157,000 | 3,616,000 |
Income from continuing operations |  |  | 1,570,000 | 1,827,000 |
Net income |  |  | $ 516,000 | $ 726,000 |

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- Definition Long-Term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership. This does not include advances to clients. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04.2) -URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e603758-122996 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6812-107765 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 2 -Article 6 + Details
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- Definition This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. + References Reference 1: 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=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=16385135&loc=d3e33749-111570 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.12) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 7 + Details
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