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Note 12 - Capital Stock (Tables)
3 Months Ended
Oct. 31, 2020
Notes Tables  
Schedule of Warrants, Valuation Assumptions [Table Text Block]
Expected Risk Free Interest Rate
   
0.14
%
Expected Annual Volatility
   
76.81
%
Expected Contractual Life in Years
   
2.00
 
Expected Annual Dividend Yield
   
0.00
%
Schedule of Net Proceeds Allocation [Table Text Block]
Fair Value of Shares
  $
12,000,000
 
Fair Value of Share Purchase Warrants
   
1,445,756
 
Total Fair Value Before Allocation to Net Proceeds
  $
13,445,756
 
         
Gross Proceeds
  $
15,000,000
 
Share Issuance Costs - Cash
   
(878,344
)
Net Cash Proceeds Received
  $
14,121,656
 
         
Relative Fair Value Allocation to:
 
 
 
 
Shares
  $
12,603,224
 
Share Purchase Warrants
   
1,518,432
 
    $
14,121,656
 
Schedule Of Share based Compensation Warrants Activity [Table Text Block]
   
Number of
Warrants
   
Weighted Average
Exercise Price
 
Balance, July 31, 2020
   
7,721,981
    $
2.03
 
Issued in connection with September 2020 Offering
   
6,833,333
     
1.80
 
Balance, October 31, 2020
 
 
14,555,314
   
$
1.92
 
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
Weighted Average
Exercise Price
   
Number of Warrants
Outstanding
   
Weighted Average
Remaining Contractual
Life (Years)
 
Expiry Date
$ 1.25      
150,000
     
0.15
 
December 23, 2020
  1.50      
150,000
     
0.15
 
December 23, 2020
  2.05      
7,063,253
     
0.42
 
April 3, 2021
  2.30      
308,728
     
1.77
 
August 9, 2022
  1.64      
50,000
     
2.55
 
May 21, 2023
  1.80      
6,833,333
     
1.89
 
September 23, 2022
$ 1.92      
14,555,314
     
1.14
 
 
Share-based Payment Arrangement, Option, Activity [Table Text Block]
   
Number of Stock
Options
   
Weighted Average
Exercise Price
 
Balance, July 31, 2020
   
15,514,750
    $
1.13
 
Exercised
   
(28,500
)    
0.93
 
Expired
   
(1,315,000
)    
1.43
 
Balance, October 31, 2020
   
14,171,250
    $
1.10
 
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, 2020
   
6,797,471
    $
0.46
 
Vested
   
(718,755
)    
0.46
 
Balance, October 31, 2020
   
6,078,716
    $
0.46
 
Share-based Payment Arrangement, Option, Exercise Price Range [Table Text Block]
 
     
Options Outstanding
   
Options Exercisable
 
Range of Exercise
Prices
 
Outstanding at October 31, 2020
   
Weighted Average Exercise Price
   
Weighted Average Remaining Contractual Term (Years)
   
Exercisable at
October 31, 2020
   
Weighted Average Exercise Price
   
Weighted Average Remaining Contractual Term (Years)
 
$0.80
to
$0.99
   
8,141,000
    $
0.92
     
7.38
     
3,487,284
    $
0.93
     
4.77
 
$1.00
to
$1.49
   
3,900,000
     
1.19
     
4.58
     
2,475,000
     
1.25
     
1.84
 
$1.50
to
$2.81
   
2,130,250
     
1.64
     
2.56
     
2,130,250
     
1.64
     
2.56
 
 
 
 
   
14,171,250
    $
1.10
     
5.88
     
8,092,534
    $
1.21
     
3.29
 
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 30, 2019
   
310,000
    $
0.94
     
1.75
    $
267,406
 
July 16, 2020
   
1,305,000
     
0.91
     
2.71
     
1,125,693
 
     
1,615,000
    $
0.92
     
2.52
    $
1,393,099
 
Share-based Payment Arrangement, Cost by Plan [Table Text Block]
   
Three Months Ended October 31,
 
   
2020
   
2019
 
Stock-Based Compensation for Consultants
 
 
 
 
 
 
 
 
Common stock issued to consultants
 
$
119,470
    $
107,608
 
Amortization of stock option expenses
 
 
103,928
     
46,971
 
   
 
223,398
     
154,579
 
Stock-Based Compensation for Management
 
 
 
 
 
 
 
 
Common stock issued to management
 
 
-
     
34,707
 
Amortization of stock option expenses
 
 
253,731
     
243,377
 
Amortization of RSU & PRSU expenses
 
 
309,378
     
135,093
 
   
 
563,109
     
413,177
 
Stock-Based Compensation for Employees
 
 
 
 
 
 
 
 
Common stock issued to employees
 
 
212,870
     
128,028
 
Amortization of stock option expenses
 
 
379,138
     
236,791
 
   
 
592,008
     
364,819
 
                 
Settlement of share issuance obligation
 
 
-
     
(15,189
)
   
$
1,378,515
    $
917,386