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Note 13 - Capital Stock - Summary of Stock Options Outstanding and Exercisable (Details) - $ / shares | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Apr. 30, 2022 | Jan. 31, 2022 | Oct. 31, 2021 | Jul. 31, 2021
Options Outstanding (in shares) | 7,881,351 | 9,063,956 | 9,323,790 | 10,404,333
Options outstanding, weighted average exercise price (in dollars per share) | $ 1.21 | $ 1.20 | $ 1.20 | $ 1.21
Options outstanding, weighted average remaining contractual term (Year) | 6 years 8 months 26 days |  |  |
Options exercisable (in shares) | 5,327,391 |  |  |
Options exercisable, weighted average exercise price (in dollars per share) | $ 1.14 |  |  |
Options exercisable, weighted average remaining contractual term (Year) | 5 years 10 months 24 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 (in shares) | 4,121,936 |  |  |
Options outstanding, weighted average exercise price (in dollars per share) | $ 0.92 |  |  |
Options outstanding, weighted average remaining contractual term (Year) | 7 years 9 months 18 days |  |  |
Options exercisable (in shares) | 3,167,875 |  |  |
Options exercisable, weighted average exercise price (in dollars per share) | $ 0.92 |  |  |
Options exercisable, weighted average remaining contractual term (Year) | 7 years 8 months 4 days |  |  |
Exercise Price Range 2 [Member] |  |  |  |
Range of Exercise Prices, Lower Limit (in dollars per share) | $ 1.00 |  |  |
Range of Exercise Prices, Upper Limit (in dollars per share) | $ 1.49 |  |  |
Options Outstanding (in shares) | 1,796,875 |  |  |
Options outstanding, weighted average exercise price (in dollars per share) | $ 1.15 |  |  |
Options outstanding, weighted average remaining contractual term (Year) | 6 years 1 month 28 days |  |  |
Options exercisable (in shares) | 913,541 |  |  |
Options exercisable, weighted average exercise price (in dollars per share) | $ 1.20 |  |  |
Options exercisable, weighted average remaining contractual term (Year) | 4 years 2 months 1 day |  |  |
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) | $ 2.89 |  |  |
Options Outstanding (in shares) | 1,962,540 |  |  |
Options outstanding, weighted average exercise price (in dollars per share) | $ 1.86 |  |  |
Options outstanding, weighted average remaining contractual term (Year) | 5 years 10 days |  |  |
Options exercisable (in shares) | 1,245,975 |  |  |
Options exercisable, weighted average exercise price (in dollars per share) | $ 1.65 |  |  |
Options exercisable, weighted average remaining contractual term (Year) | 2 years 7 months 17 days |  |  |

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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI https://asc.fasb.org/extlink&oid=128089324&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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI https://asc.fasb.org/extlink&oid=128089324&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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI https://asc.fasb.org/extlink&oid=128089324&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 https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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