Note 12 - Stock-based Compensation (Tables)

9 Months Ended

Apr. 30, 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	%
April 11, 2019		90,000		1.44		5.00		58,047		3.70		2.29	%		0.00	%		58.06	%
Total		130,000					$	82,211

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

	Number of Stock Options			Weighted Average Exercise Price
Balance, July 31, 2018		14,911,625		$	1.41
Granted		130,000			1.38
Exercised		(217,750	)		1.11
Forfeited		(87,500	)		1.42
Balance, April 30, 2019		14,736,375		$	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
Granted		130,000			0.63
Vested		(1,554,250	)		0.68
Forfeited		(75,000	)		0.67
Balance, April 30, 2019		1,980,250		$	0.67

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

			Options Outstanding						Options Exercisable
Range of Exercise Prices			Outstanding at April 30, 2019		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (Years)		Exercisable at April 30, 2019		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (Years)
$0.93	to	$1.41		11,384,875	$	1.23		1.33		10,942,625	$	1.23		1.25
$1.42	to	$3.86		3,351,500		2.04		3.23		1,813,500		2.48		2.36
				14,736,375	$	1.41		1.76		12,756,125	$	1.40		1.40

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

	Three Months Ended April 30,				Nine Months Ended April 30,
	2019		2018		2019		2018
Stock-Based Compensation for Consultants
Common stock issued for consulting services	$	155,813	$	168,107	$	516,423	$	606,885
Amortization of stock option expenses		37,336		43,463		122,056		385,082
		193,149		211,570		638,479		991,967
Stock-Based Compensation for Management
Common stock issued to management		33,126		34,265		104,109		103,509
Amortization of stock option expenses		70,395		45,926		427,099		226,907
		103,521		80,191		531,208		330,416
Stock-Based Compensation for Employees
Common stock issued to employees		132,638		120,711		381,333		497,747
Amortization of stock option expenses		125,424		106,113		592,578		440,844
		258,062		226,824		973,911		938,591
Settlement of share issuance obligation		-		-		-		(127,615	)
	$	554,732	$	518,585	$	2,143,598	$	2,133,359