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Note 5 - Stockholders' Equity - Stock Options Outstanding and Exercisable (Details) - USD ($) | 12 Months Ended
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May. 31, 2015
Range 1 [Member] |
Lower Range of Exercise Prices (in dollars per share) | $ 5
Upper Range of Exercise Prices (in dollars per share) | $ 6
Number of Shares Outstanding (in shares) | 317,750
Options Outstanding Weighted Average Remaining Contractual Life | 2 years 36 days
Options Outstanding Weighted Average Exercise Price (in dollars per share) | $ 5.65
Options Outstanding Aggregate Intrinsic Value | $ 2,746,675
Options Exercisable Number of Shares Exercisable (in shares) | 317,750
Options Exercisable Weighted Average Exercise Price (in dollars per share) | $ 5.65
Options Exercisable Aggregate Intrinsic Value | $ 2,746,675
Range 2 [Member] |
Lower Range of Exercise Prices (in dollars per share) | $ 6.01
Upper Range of Exercise Prices (in dollars per share) | $ 9
Number of Shares Outstanding (in shares) | 315,191
Options Outstanding Weighted Average Remaining Contractual Life | 1 year 302 days
Options Outstanding Weighted Average Exercise Price (in dollars per share) | $ 6.46
Options Outstanding Aggregate Intrinsic Value | $ 2,466,904
Options Exercisable Number of Shares Exercisable (in shares) | 315,191
Options Exercisable Weighted Average Exercise Price (in dollars per share) | $ 6.46
Options Exercisable Aggregate Intrinsic Value | $ 2,466,904
Range 3 [Member] |
Lower Range of Exercise Prices (in dollars per share) | $ 9.01
Upper Range of Exercise Prices (in dollars per share) | $ 14
Number of Shares Outstanding (in shares) | 140,000
Options Outstanding Weighted Average Remaining Contractual Life | 6 years 51 days
Options Outstanding Weighted Average Exercise Price (in dollars per share) | $ 12.57
Options Outstanding Aggregate Intrinsic Value | $ 240,900
Options Exercisable Number of Shares Exercisable (in shares) | 30,732
Options Exercisable Weighted Average Exercise Price (in dollars per share) | $ 10.55
Options Exercisable Aggregate Intrinsic Value | $ 115,027
Range 4 [Member] |
Lower Range of Exercise Prices (in dollars per share) | $ 14.01
Upper Range of Exercise Prices (in dollars per share) | $ 14.39
Number of Shares Outstanding (in shares) | 963,777
Options Outstanding Weighted Average Remaining Contractual Life | 6 years 142 days
Options Outstanding Weighted Average Exercise Price (in dollars per share) | $ 14.36
Options Outstanding Aggregate Intrinsic Value |
Options Exercisable Number of Shares Exercisable (in shares) | 185,791
Options Exercisable Weighted Average Exercise Price (in dollars per share) | $ 14.30
Options Exercisable Aggregate Intrinsic Value |
Range 5 [Member] |
Lower Range of Exercise Prices (in dollars per share) | $ 5
Upper Range of Exercise Prices (in dollars per share) | $ 14.39
Number of Shares Outstanding (in shares) | 1,736,718
Options Outstanding Weighted Average Remaining Contractual Life | 4 years 277 days
Options Outstanding Weighted Average Exercise Price (in dollars per share) | $ 11.19
Options Outstanding Aggregate Intrinsic Value | $ 5,454,479
Options Exercisable Number of Shares Exercisable (in shares) | 849,464
Options Exercisable Weighted Average Exercise Price (in dollars per share) | $ 8.02
Options Exercisable Aggregate Intrinsic Value | $ 5,328,606
Options Outstanding Weighted Average Exercise Price (in dollars per share) | $ 14.02

X
- 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 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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- 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 Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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 Reference 1: 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 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + 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 Weighted average remaining contractual term for option awards 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 + Details
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