Note 12 - Stock-based Compensation (Tables)

6 Months Ended

Jan. 31, 2019

Notes Tables

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

Date	Options Granted		Exercise Price		Term (Years)		Fair Value		Expected Life (Years)		Risk-Free Interest Rate			Dividend Yield			Expected Volatility
January 3, 2019		40,000	$	1.25		5.00	$	24,164		3.70		2.34	%		0.00	%		63.70	%
Total		40,000					$	24,164

Share-based Compensation, Stock Options, Activity [Table Text Block]

	Number of Stock Options			Weighted Average Exercise Price
Balance, July 31, 2018		14,911,625		$	1.41
Exercised		(183,500	)		1.19
Forfeited		(27,500	)		1.44
Balance, October 31, 2018		14,700,625		$	1.41
Granted		40,000			1.25
Exercised		(25,000	)		0.45
Forfeited		(12,500	)		1.33
Balance, January 31, 2019		14,703,125		$	1.41

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, 2018		3,479,500		$	0.68
Vested		(801,500	)		0.70
Forfeited		(27,500	)		0.67
Balance, October 31, 2018		2,650,500			0.67
Granted		40,000			0.60
Vested		(278,000	)		0.69
Balance, January 31, 2019		2,412,500		$	0.67

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

			Options Outstanding						Options Exercisable
Range of Exercise Prices			Outstanding at January 31, 2019		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (Years)		Exercisable at January 31, 2019		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (Years)
$0.93	to	$1.30		5,086,625	$	1.11		2.73		4,177,125	$	1.08		2.53
$1.31	to	$3.86		9,616,500		1.57		1.62		8,113,500		1.58		1.09
				14,703,125	$	1.41		2.00		12,290,625	$	1.41		1.58

Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]

	Three Months Ended January 31,				Six Months Ended January 31,
	2019		2018		2019		2018
Stock-Based Compensation for Consultants
Common stock issued for consulting services	$	229,806	$	157,599	$	360,610	$	438,778
Amortization of stock option expenses		30,319		341,788		84,720		341,619
		260,125		499,387		445,330		780,397
Stock-Based Compensation for Management
Common stock issued to management		35,639		34,230		70,983		69,244
Amortization of stock option expenses		139,900		86,650		356,704		180,981
		175,539		120,880		427,687		250,225
Stock-Based Compensation for Employees
Common stock issued to employees		124,872		201,714		248,695		377,036
Amortization of stock option expenses		186,806		152,114		467,154		334,731
		311,678		353,828		715,849		711,767
Settlement of share issuance obligation		-		-		-		(127,615	)
	$	747,342	$	974,095	$	1,588,866	$	1,614,774