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

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.

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

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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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
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Intrinsic value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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