Note 15 - Stock-based Compensation (Tables)

12 Months Ended

Jul. 31, 2022

Notes Tables

Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	Year Ended July 31,
	2022			2021			2020
Expected Risk Free Interest Rate		2.73	%		0.70	%		0.40	%
Expected Volatility		78.75	%		72.57	%		60.48	%
Expected Life in Years		4.96			5.00			4.93
Expected Dividend Yield		0	%		0	%		0	%
Weighted-Average Grant Date Fair Value	$	2.45		$	1.30		$	0.45

Share-Based Payment Arrangement, Option, Activity [Table Text Block]

	Number of Stock Options			Weighted Average Exercise Price
Balance, July 31, 2019		15,738,350		$	1.30
Granted		6,163,900			0.95
Cancelled/Forfeited		(179,344	)		1.02
Expired		(6,208,156	)		1.39
Balance, July 31, 2020		15,514,750			1.13
Granted		959,588			2.21
Exercised		(4,705,005	)		1.09
Expired		(1,365,000	)		1.48
Balance, July 31, 2021		10,404,333			1.21
Granted		1,279,692			3.80
Exercised		(2,728,498	)		1.17
Expired		(75,000	)		2.50
Balance, July 31, 2022		8,880,527		$	1.58

Cash Proceeds Received and Tax Benefit from Share-Based Payment Awards [Table Text Block]

	Year Ended July 31,
	2022		2021		2020
Number of Options Exercised on Cash Basis		872,580		1,734,127		-
Number of Options Exercised on Forfeiture Basis		1,855,918		2,970,878		-
Total Number of Options Exercised		2,728,498		4,705,005		-
Number of Shares Issued on Cash Exercise		872,580		1,734,127		-
Number of Shares Issued on Forfeiture Basis		1,279,515		1,592,128		-
Total Number of Shares Issued Upon Exercise of Options		2,152,095		3,326,255		-
Cash Received from Exercise of Stock Options	$	934	$	1,916	$	-
Total Intrinsic Value of Options Exercised	$	8,336	$	6,882	$	-

Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block]

	Number of Unvested Stock Options			Weighted Average Grant-Date Fair Value
Balance, July 31, 2019		3,310,600		$	0.59
Granted		6,163,900			0.45
Vested		(2,590,154	)		0.60
Cancelled/Forfeited		(86,875	)		0.43
Balance, July 31, 2020		6,797,471			0.46
Granted		959,588			1.30
Vested		(3,865,852	)		0.47
Balance, July 31, 2021		3,891,207			0.66
Granted		1,279,692			2.45
Vested		(2,984,745	)		0.59
Balance, July 31, 2022		2,186,154		$	1.79

Share-Based Payment Arrangement, Option, Exercise Price Range [Table Text Block]

			Options Outstanding						Options Exercisable
Range of Exercise Prices			Outstanding at July 31, 2022		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (Years)		Exercisable at July 31, 2022		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (Years)
$0.80	to	$0.99		3,968,499	$	0.92		7.55		3,968,499	$	0.92		7.55
$1.00	to	$1.99		2,738,875		1.29		4.23		2,297,207		1.32		3.52
$2.00	to	$2.99		903,461		2.22		8.95		416,167		2.22		8.94
$3.00	to	$3.98		1,269,692		3.80		9.75		12,500		3.18		4.91
				8,880,527	$	1.58		6.98		6,694,373	$	1.14		6.25

Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]

	Number of Restricted Stock Units			Weighted Average Grant Date Fair Value
Balance, July 31, 2019		465,000		$	0.94
Granted		1,305,000			0.91
Vested		(155,000	)		0.94
Balance, July 31, 2020		1,615,000			0.92
Granted		407,617			2.15
Vested		(1,025,005	)		0.91
Balance, July 31, 2021		997,612			1.42
Granted		346,790			4.03
Vested		(508,368	)		1.25
Balance, July 31, 2022		836,034		$	2.61

Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]

Grant Date	Number of Restricted Stock Units		Grant Date Fair Value		Remaining Life (Years)		Aggregate Intrinsic Value
July 16, 2020		217,498	$	0.91		0.96	$	913
July 21, 2021		271,746		2.15		1.98		1,141
May 01, 2022		58,824		4.25		2.75		247
July 29, 2022		287,966		3.98		3.00		1,209
		836,034	$	2.61		2.12	$	3,510

Schedule of Restricted Stock Units Activity [Table Text Block]

	Year Ended July 31,
	2022		2021		2020
Number of RSUs vested		508,368		1,025,005		155,000
Number of net RSU shares issued		267,681		536,361		105,844
Number of RSU shares forfeited as payments of withholding amount		240,687		488,644		49,156

Schedule of Performance Based Restricted Stock Units, Valuation Assumptions [Table Text Block]

	Year Ended July 31,
	2022			2021
Expected Risk Free Interest Rate		2.80	%		0.39	%
Expected Volatility		90.90	%		78.03	%
Expected Dividend Yield		0	%		0	%
Expected Life in Years		3			3
Correlation		76.89	%		66.02	%
Grant Price	$	3.98		$	2.15
Grant Date Fair Value	$	4.80		$	2.48

Schedule of Nonvested Performance-Based Units Activity [Table Text Block]

	Number of Unvested PRSUs			Weighted Average Grant Date Fair Value
Balance, July 31, 2019		890,000		$	1.15
Forfeited		(132,499	)		1.15
Balance, July 31, 2020		757,501			1.15
Granted		492,950			2.48
Balance, July 31, 2021		1,250,451			1.67
Granted		241,632			4.80
Vested		(757,501	)		1.15
Balance, July 31, 2022		734,582		$	3.24

Share-Based Payment Arrangement, Cost by Plan [Table Text Block]

	Year Ended July 31,
	2022		2021		2020
Stock-Based Compensation for Consultants
Common stock issued to consultants	$	770	$	877	$	540
Amortization of stock option expenses		220		288		240
		990		1,165		780
Stock-Based Compensation for Management
Common stock issued to management		-		135		225
Amortization of stock option expenses		471		774		645
Amortization of RSU and PRSU expenses		1,035		1,215		583
		1,506		2,124		1,453
Stock-Based Compensation for Employees
Common stock issued to employees		1,187		1,200		635
Amortization of stock option expenses		960		982		640
Amortization of RSU expenses		38		-		-
		2,185		2,182		1,275
Settlement of share issuance obligation		-		-		(15	)
	$	4,681	$	5,471	$	3,493