Stock-Based Compensation (Details 1) (USD $)	12 Months Ended
Jul. 31, 2012
Outstanding options
Outstanding Options, Shares	68,933
Outstanding Options, Weighted Average Remaining Contractual Term	3 years 3 months 18 days
Outstanding Options, Weighted Average Exercise Price	$ 11.19
Exercisable Options, Shares	68,933
Exercisable Options, Weighted Average Exercise Price	$ 11.19
Range of Exercise Prices - Range 1 [Member]
Outstanding options
Outstanding Options, Exercise price - lower limit	$ 0.00
Outstanding Options, Exercise price - upper limit	$ 5.00
Outstanding Options, Shares	3,800
Outstanding Options, Weighted Average Remaining Contractual Term	9 months 18 days
Outstanding Options, Weighted Average Exercise Price	$ 4.24
Exercisable Options, Shares	3,800
Exercisable Options, Weighted Average Exercise Price	$ 4.24
Range of Exercise Prices - Range 2 [Member]
Outstanding options
Outstanding Options, Exercise price - lower limit	$ 5.01
Outstanding Options, Exercise price - upper limit	$ 10.00
Outstanding Options, Shares	34,800
Outstanding Options, Weighted Average Remaining Contractual Term	3 years 6 months
Outstanding Options, Weighted Average Exercise Price	$ 7.45
Exercisable Options, Shares	34,800
Exercisable Options, Weighted Average Exercise Price	$ 7.45
Range of Exercise Prices - Range 3 [Member]
Outstanding options
Outstanding Options, Exercise price - lower limit	$ 10.01
Outstanding Options, Exercise price - upper limit	$ 15.00
Outstanding Options, Shares
Outstanding Options, Weighted Average Remaining Contractual Term	6 months
Outstanding Options, Weighted Average Exercise Price	$ 11.90
Exercisable Options, Weighted Average Exercise Price	$ 11.90
Range of Exercise Prices - Range 4 [Member]
Outstanding options
Outstanding Options, Exercise price - lower limit	$ 15.01
Outstanding Options, Exercise price - upper limit	$ 20.00
Outstanding Options, Shares	30,333
Outstanding Options, Weighted Average Remaining Contractual Term	1 year 7 months 6 days
Outstanding Options, Weighted Average Exercise Price	$ 16.35
Exercisable Options, Shares	30,333
Exercisable Options, Weighted Average Exercise Price	$ 16.35

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

+ References

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- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 64

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (g)

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

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- Definition

The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(c)

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(iii)

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

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- Definition

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)-(ii)

-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 b(1)(a, 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.

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- Definition

The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ References

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- Definition

Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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