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Note 9 - Long-term Debt (Tables)
12 Months Ended
Jul. 31, 2021
Credit Agreement [Member]  
Notes Tables  
Schedule of Long-term Debt Instruments [Table Text Block]
   
July 31, 2021
   
July 31, 2020
 
Principal amount
 
$
10,000,000
    $
20,000,000
 
Unamortized discount and accrued fees
 
 
75,231
     
(130,523
)
Long-term debt, net of unamortized discount
 
$
10,075,231
    $
19,869,477
 
Current portion
 
 
10,075,231
     
-
 
Long-term debt, net of current portion
 
$
-
    $
19,869,477