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Note 6 - Restricted Cash (Tables)
12 Months Ended
Jul. 31, 2021
Notes Tables  
Restrictions on Cash and Cash Equivalents [Table Text Block]
   
July 31, 2021
   
July 31, 2020
 
Restricted cash, beginning of period
 
$
1,839,216
    $
1,821,392
 
Additional surety bond collateral
 
 
198,377
     
-
 
Interest received
 
 
84
     
17,824
 
Restricted cash, end of period
 
$
2,037,677
    $
1,839,216
 
Schedule of Cash and Cash Equivalents and Restricted Cash [Table Text Block]
   
July 31, 2021
   
July 31, 2020
 
Cash and cash equivalents
 
$
44,312,780
    $
5,147,703
 
Restricted cash
 
 
2,037,677
     
1,839,216
 
Total cash, cash equivalents and restricted cash
 
$
46,350,457
    $
6,986,919