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Note 14 - Stock-based Compensation (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Jul. 31, 2021 | Jul. 30, 2021 | Jul. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) | 959,588 | 959,588 | 6,163,900
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value | $ 10,147,195 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value | 6,597,753 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Unvested in Period, Intrinsic Value | 3,549,442 |  |
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture, Total | 1,594,246 |  | $ 1,122,917
Share Issuance Obligation Amount | $ 359,560 |  | $ 103,554
Share-based Payment Arrangement, Option [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) | 959,588 |  | 4,838,900
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Month) | 2 years |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ 1,711,602 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) | 1 year 54 days |  |
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) | 90 days |  |
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) | 180 days |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | 12.50% |  |
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) | 1 year |  |
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 Five [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Month) | 2 years |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | 25.00% |  |
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) | 1 year 180 days |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | 25.00% |  |
Performance Stock Option [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) | 1,325,000 |  |
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% |  |
Performance Stock Option [Member] | Share-based Payment Arrangement, Tranche Two [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | 33.33% |  |
Performance Stock Option [Member] | Share-based Payment Arrangement, Tranche Three [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
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ 1,132,372 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) | 1 year 310 days |  |
Share-based Payment Arrangement, Expense | $ 1,059,505 |  | $ 310,127
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) | 1,025,005 |  | 155,000
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture, Total (in shares) | 536,361 |  | 105,844
Shares Issued, Shares, Share-based Payment Arrangement, Forfeited (in shares) | 488,644 |  | 49,156
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 407,617 |  | 1,305,000
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% |  | 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 | 33.33% |  | 16.67%
Restricted Stock Units (RSUs) [Member] | Share-based Compensation Award, Tranche Four [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  | 16.67%
Restricted Stock Units (RSUs) [Member] | Share-based Payment Arrangement, Tranche Three [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | 33.33% |  | 16.67%
Performance-based Restriced Stock Units [Member] |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ 694,998 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) | 1 year 277 days |  |
Share-based Payment Arrangement, Expense | $ 156,055 |  | $ 272,658
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture, Total (in shares) | 222,500 |  | 90,001
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 492,950 |  | 0
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% |  |
The 2020 Stock Incentive Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) | 0 |  |
The 2020 Stock Incentive Plan [Member] | Performance-based Restriced Stock Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 246,475 |  |
The 2019 Stock Incentive Plan [Member] |  |  |
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture, Total (in shares) |  |  | 188,914
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture, Total |  |  | $ 171,911
Share Issuance Obligation Amount |  |  | $ 187,100

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