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Note 14 - Stock-based Compensation - Number of Shares Issued and Cash Received upon Exercise of the Stock Options (Details) - USD ($) | 12 Months Ended
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Jul. 31, 2021 | Jul. 31, 2020
Number of Options Exercised on Forfeiture Basis (in shares) | 2,970,878 |
Number of Options Exercised on Cash Basis (in shares) | 1,734,127 |
Total Number of Options Exercised (in shares) | 4,705,005 |
Number of Shares Issued on Cash Exercise (in shares) | 1,734,127 |
Number of Shares Issued on Forfeiture Basis (in shares) | 1,592,128 |
Total Number of Shares Issued Upon Exercise of Options (in shares) | 3,326,255 |
Cash Received from Exercise of Stock Options | $ 1,915,995 |
Total Intrinsic Value of Options Exercised | $ 6,882,464 |

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- Definition Number of share options (or share units) exercised during the current period. + References No definition available. + Details
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- Definition Number of share options (or share units) exercised during the current period on cash basis. + References No definition available. + Details
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- Definition Number of share options (or share units) exercised during the current period on forfeiture basis. + References No definition available. + Details
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- Definition Number of share options (or share units) exercised on a forfeiture basis during the current period. + References No definition available. + Details
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- Definition Amount of cash inflow from exercise of option under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120381028&loc=SL79508275-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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