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Note 14 - Stock-based Compensation - Summary of Outstanding Unvested RSUs (Details) - Restricted Stock Units (RSUs) [Member] - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Jul. 31, 2021 | Jul. 31, 2020 | Jul. 31, 2019
Number of Restricted Stock Units (in shares) | 997,612 | 1,615,000 | 465,000
Grant Date Fair Value (in dollars per share) | $ 1.42 | $ 0.92 | $ 0.94
Remaining Life (Year) | 2 years 80 days |  |
Aggregate Intrinsic Value | $ 2,164,818 |  |
July 30, 2019 [Member] |  |  |
Number of Restricted Stock Units (in shares) | 154,999 |  |
Grant Date Fair Value (in dollars per share) | $ 0.94 |  |
Remaining Life (Year) | 1 year |  |
Aggregate Intrinsic Value | $ 336,348 |  |
July 16, 2020 [Member] |  |  |
Number of Restricted Stock Units (in shares) | 434,996 |  |
Grant Date Fair Value (in dollars per share) | $ 0.91 |  |
Remaining Life (Year) | 1 year 350 days |  |
Aggregate Intrinsic Value | $ 943,941 |  |
July 21, 2021 [Member] |  |  |
Number of Restricted Stock Units (in shares) | 407,617 |  |
Grant Date Fair Value (in dollars per share) | $ 2.15 |  |
Remaining Life (Year) | 2 years 357 days |  |
Aggregate Intrinsic Value | $ 884,529 |  |

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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit 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 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, 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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- Definition Intrinsic value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References No definition available. + Details
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