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Note 17 - Stock-based Compensation - Schedule of Unvested Performance Restricted Stock Options (Details) - Performance-based Restriced Stock Units [Member] - $ / shares
12 Months Ended
Jul. 31, 2023
Jul. 31, 2022
Jul. 31, 2021
Balance, number of restricted stock units (in shares) 734,582 1,250,451 757,501
Balance, weighted average grant date fair value (in dollars per share) $ 3.24 $ 1.67 $ 1.15
Granted, number of restricted stock units (in shares) 551,923 241,632 492,950
Granted, Weighted Average Grant Date Fair Value (in dollars per share) $ 3.35 $ 4.80 $ 2.48
Vested, number of unvested PRSUs (in shares)   (757,501)  
Vested, weighted average grant date fair value (in dollars per share)   $ 1.15  
Balance, number of restricted stock units (in shares) 1,286,505 734,582 1,250,451
Balance, weighted average grant date fair value (in dollars per share) $ 3.29 $ 3.24 $ 1.67