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Note 14 - Stock-based Compensation - Summary of Stock Options Outstanding and Exercisable (Details) - $ / shares | 12 Months Ended |  |
--- | --- | --- | ---
Jul. 31, 2021 | Jul. 31, 2020 | Jul. 31, 2019
Options Outstanding Outstanding (in shares) | 10,404,333 | 15,514,750 | 15,738,350
Options Outstanding Weighted Average Exercise Price (in dollars per share) | $ 1.21 | $ 1.13 | $ 1.30
Options Outstanding Weighted Average Remaining Contractual Term (Year) | 6 years 317 days |  |
Options Exercisable (in shares) | 6,513,126 |  |
Options Exercisable Weighted Average Exercise Price (in dollars per share) | $ 1.16 |  |
Options Exercisable Weighted Average Remaining Contractual Term (Year) | 5 years 178 days |  |
Exercise Price Range 1 [Member] |  |  |
Range of Exercise Prices, Lower Limit (in dollars per share) | $ 0.80 |  |
Range of Exercise Prices, Upper Limit (in dollars per share) | $ 0.99 |  |
Options Outstanding Outstanding (in shares) | 5,342,620 |  |
Options Outstanding Weighted Average Exercise Price (in dollars per share) | $ 0.92 |  |
Options Outstanding Weighted Average Remaining Contractual Term (Year) | 8 years 204 days |  |
Options Exercisable (in shares) | 3,289,024 |  |
Options Exercisable Weighted Average Exercise Price (in dollars per share) | $ 0.92 |  |
Options Exercisable Weighted Average Remaining Contractual Term (Year) | 8 years 127 days |  |
Exercise Price Range 2 [Member] |  |  |
Range of Exercise Prices, Lower Limit (in dollars per share) | $ 1 |  |
Range of Exercise Prices, Upper Limit (in dollars per share) | $ 1.49 |  |
Options Outstanding Outstanding (in shares) | 2,500,125 |  |
Options Outstanding Weighted Average Exercise Price (in dollars per share) | $ 1.17 |  |
Options Outstanding Weighted Average Remaining Contractual Term (Year) | 5 years 109 days |  |
Options Exercisable (in shares) | 1,616,791 |  |
Options Exercisable Weighted Average Exercise Price (in dollars per share) | $ 1.21 |  |
Options Exercisable Weighted Average Remaining Contractual Term (Year) | 3 years 109 days |  |
Exercise Price Range 3 [Member] |  |  |
Range of Exercise Prices, Lower Limit (in dollars per share) | $ 1.50 |  |
Range of Exercise Prices, Upper Limit (in dollars per share) | $ 2.80 |  |
Options Outstanding Outstanding (in shares) | 2,561,588 |  |
Options Outstanding Weighted Average Exercise Price (in dollars per share) | $ 1.84 |  |
Options Outstanding Weighted Average Remaining Contractual Term (Year) | 4 years 317 days |  |
Options Exercisable (in shares) | 1,607,311 |  |
Options Exercisable Weighted Average Exercise Price (in dollars per share) | $ 1.61 |  |
Options Exercisable Weighted Average Remaining Contractual Term (Year) | 1 year 313 days |  |

X
- Definition Represents the lower range of exercise price under share-based compensation arrangement by share-based payment award. + References No definition available. + Details
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- Definition Represents the upper range of exercise price under share-based compensation arrangement by share-based payment award. + References No definition available. + 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. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&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://fasb.org/us-gaap/role/ref/legacyRef -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=120381028&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=120381028&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://fasb.org/us-gaap/role/ref/legacyRef -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=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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