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Note 9 - Long-term Debt (Tables)
6 Months Ended
Jan. 31, 2020
Notes Tables  
Schedule of Long-term Debt Instruments [Table Text Block]
   
January 31, 2020
   
July 31, 2019
 
Principal amount
 
$
20,000,000
    $
20,000,000
 
Unamortized discount and accrued fees
 
 
(955,236
)
   
(400,037
)
Long-term debt, net of unamortized discount
 
$
19,044,764
    $
19,599,963
 
Schedule of Maturities of Long-term Debt [Table Text Block]
Fiscal 2020
  $
-
 
Fiscal 2021
   
-
 
Fiscal 2022
   
20,000,000
 
Total
  $
20,000,000