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Stockholders' Equity (Details) $ / shares in Units, $ in Thousands | 12 Months Ended
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May 31, 2016 USD ($) $ / shares shares
Schedule summarizes stock option activity |
Shares Outstanding at beginning of year | shares | 2,299,313
Shares Granted | shares | 564,380
Shares Exercised | shares | (145,260)
Shares Forfeited | shares | (304,563)
Shares Expired | shares | (132,252)
Shares Outstanding at end of year | shares | 2,281,618
Shares Options exercisable at year end | shares | 1,313,698
Shares Option expected to vest in future periods | shares | 854,189
Weighted Average exercise price, Outstanding at beginning of year | $ / shares | $ 14.86
Weighted Average exercise price Granted | $ / shares | 14.22
Weighted Average exercise price Exercised | $ / shares | 13.73
Weighted Average exercise price Forfeited | $ / shares | 13.85
Weighted Average exercise price Expired | $ / shares | 22.75
Weighted Average exercise price, Outstanding at end of year | $ / shares | 14.45
Weighted Average exercise price, Options exercisable at year end | $ / shares | 14.25
Weighted Average exercise price, Options expected to vest in future periods | $ / shares | $ 14.72
Weighted Average remaining contractual life | 3 years 9 months 14 days
Weighted Average remaining contractual life, Option exercisable at year end | 2 years 4 months 2 days
Weighted Average remaining contractual life, Option expected to vest in future periods | 5 years 9 months 3 days
Aggregate intrinsic value, Outstanding at end of year | $ | $ 164
Aggregate intrinsic value, Options exercisable at year end | $ | 130
Aggregate intrinsic value, Option expected to vest in future periods | $ | $ 30

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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. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + 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)(iv)(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + 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)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 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)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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