Note 13 - Stock-based Compensation (Tables)

12 Months Ended

Jul. 31, 2019

Notes Tables

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

	Year Ended July 31,
	2019		2018		2017
Expected Risk Free Interest Rate		1.86%		2.24%		1.28%
Expected Volatility		65.62%		67.60%		82.40%
Expected Life in Years		4.9		3.1		2.9
Expected Dividend Yield		0%		0%		0%
Weighted-Average Grant Date Fair Value		$0.53		$0.68		$0.77

Expected Risk Free Interest Rate	1.99%	to	2.20%
Expected Volatility	56.74%	to	61.75%
Expected Dividend Yield		0%
Expected Life in Years		3
Correlation		57.10%

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

	Number of Stock Options			Weighted Average Exercise Price
Balance, July 31, 2016		12,105,858		$	1.34
Granted		672,500			1.11
Exercised		(412,134	)		0.56
Expired		(100,724	)		4.35
Forfeited		(5,000	)		0.93
Balance, July 31, 2017		12,260,500			1.33
Granted		4,083,000			1.40
Exercised		(1,365,625	)		0.70
Forfeited		(66,250	)		1.24
Balance, July 31, 2018		14,911,625			1.41
Granted		2,006,350			0.97
Exercised		(259,625	)		1.12
Forfeited/cancelled		(910,000	)		2.41
Expired		(10,000	)		1.50
Balance, July 31, 2019		15,738,350		$	1.30

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

	Year Ended July 31,
	2019		2018		2017
Number of Shares Issued Upon Exercise of Options		125,879		1,094,589		264,727
Number of Options Exercised on Forfeiture Basis		193,375		580,625		309,634
Number of Net Shares Issued		59,629		309,589		162,227
Number of Options Exercised on Cash Basis		66,250		785,000		102,500
Cash Received from Exercise of Stock Options	$	72,363	$	530,050	$	56,925
Total Intrinsic Value of Options Exercised	$	134,174	$	1,049,694	$	232,205

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, 2016		2,323,000		$	0.51
Granted		672,500			0.77
Vested		(2,224,750	)		0.56
Forfeited		(5,000	)		0.49
Balance, July 31, 2017		765,750			0.58
Granted		4,083,000			0.68
Vested		(1,303,000	)		0.65
Forfeited		(66,250	)		0.62
Balance, July 31, 2018		3,479,500		$	0.68
Granted		2,006,350			0.53
Vested		(2,055,250	)		0.68
Forfeited		(120,000	)		0.67
Balance, July 31, 2019		3,310,600		$	0.59

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

			Options Outstanding						Options Exercisable
Range of Exercise Prices			Outstanding at July 31, 2019		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (Years)		Exercisable at July 31, 2019		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (Years)
$0.93	to	$0.99		3,643,100	$	0.94		6.07		1,766,750	$	0.94		1.90
$1.00	to	$1.49		9,465,000		1.28		0.97		8,989,000		1.28		0.85
$1.50	to	$3.75		2,630,250		1.86		3.29		1,672,000		2.06		2.89
				15,738,350	$	1.30		2.54		12,427,750	$	1.34		1.27

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

	Year Ended July 31,
	2019		2018			2017
Stock-Based Compensation for Consultants
Common stock issued for consulting services	$	644,307	$	740,640		$	1,184,660
Amortization of stock option expenses		153,549		582,842			469,815
		797,856		1,323,482			1,654,475
Stock-Based Compensation for Management
Common stock issued to management		269,688		702,505			686,584
Amortization of stock option expenses		516,266		284,556			473,811
		785,954		987,061			1,160,395
Stock-Based Compensation for Employees
Common stock issued to employees		674,488		773,899			584,837
Amortization of stock option expenses		689,743		547,231			369,663
		1,364,231		1,321,130			954,500
Settlement of share issuance obligation		-		(127,615	)		-
	$	2,948,041	$	3,504,058		$	3,769,370