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Derivative Instruments and Foreign Currency Exposure (Details Textual) - USD ($) | 3 Months Ended
--- | ---
Apr. 30, 2016 | Apr. 30, 2015
Derivative [Line Items] |  |
Other Comprehensive Income, Other, Net of Tax | $ 0 | $ 115,482
Derivative Financial Instruments, Assets [Member] |  |
Derivative [Line Items] |  |
Other Assets | $ 0 | $ 3,300,000

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- Definition The aggregate carrying amounts, as of the balance sheet date, of assets not separately disclosed in the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Article 7 + Details
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