Note 17 - Stock-based Compensation (Details Textual) - USD ($) $ in Thousands	12 Months Ended
Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2021
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)	1,205,254	1,279,692	959,588
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value	$ 14,458
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value	14,121
Share-based Compensation Arrangement by Share-based Payment Award, Options, Unvested in Period, Intrinsic Value	337
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 3,086
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	1 year 2 months 15 days
Share-Based Payment Arrangement, Expense	$ 5,415	$ 4,540	$ 5,411
Share-Based Payment Arrangement, Option [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)	3,507,004	1,279,692	959,588
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Month)	24 months
Share-Based Payment Arrangement, Option [Member] \| Share-Based Payment Arrangement, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Month)	3 months
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	12.50%
Share-Based Payment Arrangement, Option [Member] \| Share-Based Payment Arrangement, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Month)	6 months
Share-Based Payment Arrangement, Option [Member] \| Share-Based Payment Arrangement, Tranche Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Month)	12 months
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	25.00%
Share-Based Payment Arrangement, Option [Member] \| Share-based Compensation Award, Tranche Four [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Month)	18 months
Share-Based Payment Arrangement, Option [Member] \| Share-based Compensation Award, Tranche Five [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Month)	24 months
Performance Stock Option [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)	150,367
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Month)	3 years
Performance Stock Option [Member] \| Share-Based Payment Arrangement, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	33.33%
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Month)	3 years	3 years	3 years
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 2,656
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	1 year 10 months 13 days
Share-Based Payment Arrangement, Expense	$ 1,105	$ 780	$ 1,060
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	620,386	346,790	407,617
Restricted Stock Units (RSUs) [Member] \| Share-Based Payment Arrangement, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	33.33%	33.33%	50.00%
Restricted Stock Units (RSUs) [Member] \| Share-Based Payment Arrangement, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage			16.67%
Performance-based Restriced Stock Units [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 1,507
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	2 years 5 months 12 days
Share-Based Payment Arrangement, Expense	$ 397	$ 293	$ 156
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	551,923	241,632	492,950
Performance-based Restriced Stock Units [Member] \| Minimum [Member]
Share-based Compensation Arrangement By Share-based Payment Award, Percentage Eligible to Vest	0.00%
Performance-based Restriced Stock Units [Member] \| Maximum [Member]
Share-based Compensation Arrangement By Share-based Payment Award, Percentage Eligible to Vest	200.00%
Performance-based Restriced Stock Units [Member] \| The 2020 Stock Incentive Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	551,923	241,632	492,950

Amount by which current fair value of underlying stock exceeds exercise price of unvested options outstanding.

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The percent of share-based compensation awards eligible to vest.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Gross number of share options (or share units) granted during the period.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Percentage of vesting of award under share-based payment arrangement.

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