Total Unrecognized Compensation Costs Related To Non-Vested Stock-Based Compensation Arrangements (Detail) (USD $)	12 Months Ended
Jan. 31, 2013
Common stock options
Employee Service Share -Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized [Line Items]
Unrecognized compensation cost	$ 521,611
Weighted Average Remaining Life (Years)	10 months 24 days
ACO Plan restricted stock
Employee Service Share -Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized [Line Items]
Unrecognized compensation cost	$ 24,600
Weighted Average Remaining Life (Years)	1 year 10 months 24 days

As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph h

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant