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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