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Stockholders' equity (Details) - Schedule of Stock option plans (USD $)
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6 Months Ended | 12 Months Ended | ||
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Jan. 17, 2013
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Jul. 31, 2013
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Jul. 31, 2012
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Jul. 31, 2011
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| Schedule of Stock option plans [Abstract] | ||||
| Outstanding at beginning of year (in Shares) | 736,490 | 736,490 | 785,124 | 1,132,450 |
| Outstanding at beginning of year | $ 14.50 | $ 14.50 | $ 14.53 | $ 14.30 |
| New Grants (in Shares) | 336,817 | 336,817 | ||
| New Grants | $ 2.88 | $ 2.88 | ||
| Expired (in Shares) | (346,662) | (48,634) | (347,326) | |
| Expired | $ 11.82 | $ 15.05 | $ 13.78 | |
| Outstanding at end of year (in Shares) | 726,645 | 736,490 | 785,124 | |
| Outstanding at end of year | $ 10.39 | $ 14.50 | $ 14.53 | |
| Exercisable at end of year (in Shares) | 389,828 | 736,490 | 785,124 | |
| Exercisable at end of year | $ 16.88 | $ 14.50 | $ 14.53 | |
| Weighted average fair value of options granted during year | $ 1.22 | |||
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- Details
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- Definition
The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Weighted average price of options that were either forfeited or expired. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Gross number of share options (or share units) granted during the period. No definition available.
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- Definition
The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Number of options outstanding, including both vested and non-vested options. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. No definition available.
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