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Note 12 - Stock-based Compensation - Summary of Stock Options Outstanding and Exercisable (Details) - $ / shares | 6 Months Ended |  |
--- | --- | --- | ---
Jan. 31, 2024 | Oct. 31, 2023 | Jul. 31, 2023
Options Outstanding (in shares) | 6,649,539 | 7,518,042 | 8,326,983
Options outstanding, weighted average exercise price (in dollars per share) | $ 2.01 | $ 1.94 | $ 1.92
Options outstanding, weighted average remaining contractual term (Year) | 7 years 1 month 13 days |  |
Options exercisable (in shares) | 5,393,649 |  |
Options exercisable, weighted average exercise price (in dollars per share) | $ 1.65 |  |
Options exercisable, weighted average remaining contractual term (Year) | 6 years 8 months 12 days |  |
Exercise Price Range 1 [Member] |  |  |
Range of Exercise Prices, Lower Limit (in dollars per share) | $ 0.8 |  |
Range of Exercise Prices, Upper Limit (in dollars per share) | $ 0.99 |  |
Options Outstanding (in shares) | 2,402,500 |  |
Options outstanding, weighted average exercise price (in dollars per share) | $ 0.92 |  |
Options outstanding, weighted average remaining contractual term (Year) | 5 years 11 months 26 days |  |
Options exercisable (in shares) | 2,402,500 |  |
Options exercisable, weighted average exercise price (in dollars per share) | $ 0.92 |  |
Options exercisable, weighted average remaining contractual term (Year) | 5 years 11 months 26 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) | $ 1.99 |  |
Options Outstanding (in shares) | 1,350,000 |  |
Options outstanding, weighted average exercise price (in dollars per share) | $ 1.11 |  |
Options outstanding, weighted average remaining contractual term (Year) | 6 years 4 months 2 days |  |
Options exercisable (in shares) | 1,350,000 |  |
Options exercisable, weighted average exercise price (in dollars per share) | $ 1.11 |  |
Options exercisable, weighted average remaining contractual term (Year) | 6 years 4 months 2 days |  |
Exercise Price Range 3 [Member] |  |  |
Range of Exercise Prices, Lower Limit (in dollars per share) | $ 2 |  |
Range of Exercise Prices, Upper Limit (in dollars per share) | $ 2.99 |  |
Options Outstanding (in shares) | 608,399 |  |
Options outstanding, weighted average exercise price (in dollars per share) | $ 2.24 |  |
Options outstanding, weighted average remaining contractual term (Year) | 7 years 5 months 4 days |  |
Options exercisable (in shares) | 608,399 |  |
Options exercisable, weighted average exercise price (in dollars per share) | $ 2.24 |  |
Options exercisable, weighted average remaining contractual term (Year) | 7 years 5 months 4 days |  |
Exercise Price Range 4 [Member] |  |  |
Range of Exercise Prices, Lower Limit (in dollars per share) | $ 3 |  |
Range of Exercise Prices, Upper Limit (in dollars per share) | $ 3.99 |  |
Options Outstanding (in shares) | 2,258,640 |  |
Options outstanding, weighted average exercise price (in dollars per share) | $ 3.6 |  |
Options outstanding, weighted average remaining contractual term (Year) | 8 years 8 months 4 days |  |
Options exercisable (in shares) | 1,030,562 |  |
Options exercisable, weighted average exercise price (in dollars per share) | $ 3.72 |  |
Options exercisable, weighted average remaining contractual term (Year) | 8 years 4 months 24 days |  |
Exercise Price Range 5 [Member] |  |  |
Range of Exercise Prices, Lower Limit (in dollars per share) | $ 4 |  |
Range of Exercise Prices, Upper Limit (in dollars per share) | $ 4.99 |  |
Options Outstanding (in shares) | 7,500 |  |
Options outstanding, weighted average exercise price (in dollars per share) | $ 4.48 |  |
Options outstanding, weighted average remaining contractual term (Year) | 9 years 3 months 21 days |  |
Options exercisable (in shares) | 625 |  |
Options exercisable, weighted average exercise price (in dollars per share) | $ 4.72 |  |
Options exercisable, weighted average remaining contractual term (Year) | 9 years 7 months 6 days |  |
Exercise Price Range 6 [Member] |  |  |
Range of Exercise Prices, Lower Limit (in dollars per share) | $ 5 |  |
Range of Exercise Prices, Upper Limit (in dollars per share) | $ 5.99 |  |
Options Outstanding (in shares) | 12,500 |  |
Options outstanding, weighted average exercise price (in dollars per share) | $ 5.16 |  |
Options outstanding, weighted average remaining contractual term (Year) | 9 years 7 months 28 days |  |
Options exercisable (in shares) | 1,563 |  |
Options exercisable, weighted average exercise price (in dollars per share) | $ 5.16 |  |
Options exercisable, weighted average remaining contractual term (Year) | 9 years 7 months 28 days |  |
Exercise Price Range 7 [Member] |  |  |
Range of Exercise Prices, Lower Limit (in dollars per share) | $ 7 |  |
Range of Exercise Prices, Upper Limit (in dollars per share) | $ 7.63 |  |
Options Outstanding (in shares) | 10,000 |  |
Options outstanding, weighted average exercise price (in dollars per share) | $ 7.63 |  |
Options outstanding, weighted average remaining contractual term (Year) | 9 years 11 months 23 days |  |
Options exercisable (in shares) | 0 |  |
Options exercisable, weighted average exercise price (in dollars per share) | $ 0 |  |

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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/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + 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/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + 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/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + 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/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + 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 -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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