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Note 9 - Long-term Debt (Tables)
9 Months Ended
Apr. 30, 2019
Notes Tables  
Schedule of Long-term Debt Instruments [Table Text Block]
   
April 30, 2019
   
July 31, 2018
 
Principal amount
 
$
20,000,000
    $
20,000,000
 
Unamortized discount
 
 
(814,355
)
   
(465,026
)
Long-term debt, net of unamortized discount
 
 
19,185,645
     
19,534,974
 
Current portion
 
 
-
     
10,000,000
 
Long-term debt, net of current portion
 
$
19,185,645
    $
9,534,974