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Debt (Narrative) (Details) (USD $) | 12 Months Ended |  |  |  | 3 Months Ended |  |  |  |  | 12 Months Ended
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Jan. 31, 2013 | Jan. 31, 2013 Accounts receivable [Member] | Jan. 31, 2013 Inventory [Member] | Jan. 31, 2013 Minimum [Member] | Jan. 31, 2013 Maximum [Member] | Jan. 31, 2013 Maximum [Member] Accounts receivable [Member] | Jan. 31, 2013 Credit Agreement [Member] | Jan. 31, 2013 Amendment No. 5 to the Credit Agreement [Member] | Dec. 22, 2011 Wells Fargo Bank [Member] Revolving Credit Facility [Member] Amendment No. 2 to the Credit Agreement [Member] | Jan. 31, 2013 PNC [Member] Revolving Credit Facility [Member] | Jul. 14, 2012 PNC [Member] Revolving Credit Facility [Member] Amendment No. 1 to the Credit Agreement [Member] | Jul. 27, 2012 PNC [Member] Revolving Credit Facility [Member] Amendment No. 2 to the Credit Agreement [Member] | Jan. 31, 2013 PNC [Member] Revolving Credit Facility [Member] Credit Agreement [Member] | Dec. 22, 2011 PNC [Member] Revolving Credit Facility [Member] Credit Agreement [Member] | Jan. 31, 2013 PNC [Member] Revolving Credit Facility [Member] Amendment No. 5 to the Credit Agreement [Member] | Jan. 31, 2013 Eurodollar [Member] Minimum [Member] | Jan. 31, 2013 Eurodollar [Member] Maximum [Member] | Jan. 31, 2013 Alternate Base Rate Loans [Member] London Interbank Offered Rate LIBOR [Member] Minimum [Member] | Jan. 31, 2013 Alternate Base Rate Loans [Member] London Interbank Offered Rate LIBOR [Member] Maximum [Member]
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in borrowing capacity |  |  |  |  |  |  |  |  |  |  | $ 3,000,000 |  |  |  |  |  |  |  |
Outstanding borrowings |  |  |  |  |  |  |  |  | 9,800,000 |  |  |  |  |  |  |  |  |  |
Minimum EBITDA | 2,582,000 |  |  |  |  |  | 5,232,000 | 2,100,000 |  |  |  | 300,000 |  | 1,600,000 |  |  |  |  |
Debt Instrumet, Covenant, Maintained Tangible Net Worth | 27,020,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility | 60,000,000 |  |  | 6,000,000 | 12,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility borrowing base limitation |  | 85.00% | 60.00% |  |  | 85.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility bears interest range of |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.75% | 2.75% | 0.75% | 1.75%
Remaining borrowing capacity |  |  |  |  |  |  |  |  |  | 4,841,000 |  |  |  |  |  |  |  |  |
Minimum tangible net worth covenant |  |  |  |  |  |  |  |  |  |  |  |  | 30,748,000 |  | 22,865,000 |  |  |  |
Sub-limit for issuances of letters of credit | 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility bears interest increased | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum fixed charge coverage ratio | 0.90 |  |  |  |  |  | 1.10 |  |  |  |  |  |  |  |  |  |  |  |
Provision to reduce borrowings under the line | 6,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provision to reduce borrowings under the line, period | 60 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Judgments or judicial actions against the borrowers in excess | $ 250,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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 210.5-02.19(b),22(b)) -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 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The percentage points added to the reference rate or index during the adjustment period to compute the variable [fully indexed] rate on the loans receivable realized during the reporting period. This may be an effective margin for the period depending on the specific terms of the underlying loan agreement (for example, an annual disclosure for a loan with a quarterly adjustment period). + References No definition available. + Details
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- Definition The lowest amount of net worth (total assets minus total liabilities) required by secondary market investors or state-imposed regulatory mandates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47304-110998 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Paragraph 54 -Subparagraph 3a -IssueDate 2006-05-01 -Chapter 17 -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c)(a) -URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47080-110998 + Details
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