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Note 10 - Long-term Debt (Tables)
12 Months Ended
Jul. 31, 2019
Notes Tables  
Schedule of Long-term Debt Instruments [Table Text Block]
   
July 31, 2019
   
July 31, 2018
 
Principal amount
 
$
20,000,000
    $
20,000,000
 
Unamortized discount
 
 
(400,037
)
   
(465,026
)
Long-term debt, net of unamortized discount
 
 
19,599,963
     
19,534,974
 
Current portion
 
 
-
     
10,000,000
 
Long-term debt, net of current portion
 
$
19,599,963
    $
9,534,974
 
Schedule of Maturities of Long-term Debt [Table Text Block]
Fiscal 2020
  $
-
 
Fiscal 2021
   
-
 
Fiscal 2022
   
20,000,000
 
Total
  $
20,000,000