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Note 5 - Stockholders' Equity - Vested and Expected to Vest Option Awards (Details) - USD ($) $ in Thousands	12 Months Ended
	May. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options Vested, Outstanding Number	849,464
Vested (in dollars per share)	$ 8.02
Vested	2 years 270 days
Vested	$ 5,328,606
Expected to vest (in shares)	861,612
Expected to vest (in dollars per share)	$ 14.22
Expected to vest	6 years 251 days
Expected to vest	$ 123,261
Total (in shares)	1,711,076
Total (in dollars per share)	$ 11.14
Total	4 years 266 days
Total	$ 5,451,867

X

- Definition

Amount by which the current fair value of the underlying stock exceeds the exercise price of expected to vest options outstanding.

+ References

No definition available.

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X

- Definition

As of the balance sheet date, the number of shares into which expected to vest stock options outstanding can be converted under the option plan.

+ References

No definition available.

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X

- Definition

As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are expected to vest.

+ References

No definition available.

+ Details

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X

- Definition

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

+ References

No definition available.

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X

- Definition

Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested options outstanding.

+ References

No definition available.

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X

- Definition

As of the balance sheet date, the number of shares into which fully vested stock options outstanding can be converted under the option plan.

+ References

No definition available.

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X

- Definition

As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested.

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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- Definition

Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest 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



-Subparagraph (e)



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

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- Definition

As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be 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 (e)(1)



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

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- Definition

As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

+ 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 (e)(1)



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

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- Definition

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

+ 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 (e)(1)



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

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