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Note 15 - Stock-based Compensation (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Jul. 31, 2022
Jul. 31, 2021
Jul. 31, 2020
Jul. 31, 2019
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) 1,279,692 959,588 6,163,900  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value $ 23,292      
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value 20,469      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Unvested in Period, Intrinsic Value 2,823      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 3,196      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) 1 year 2 months 1 day      
Share-Based Payment Arrangement, Option [Member]        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) 1,279,692 959,588 4,838,900  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Month)   24 months    
Share-Based Payment Arrangement, Option [Member] | Share-Based Payment Arrangement, Tranche One [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Month)   3 months    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   12.50%    
Share-Based Payment Arrangement, Option [Member] | Share-Based Payment Arrangement, Tranche Two [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Month)   6 months    
Share-Based Payment Arrangement, Option [Member] | Share-based Compensation Award, Tranche Five [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Month) 12 months 18 months 24 months  
Share-Based Payment Arrangement, Option [Member] | Share-Based Payment Arrangement, Tranche Three [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 25.00%      
Performance Stock Option [Member]        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) 1,325,000      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Month) 3 years      
Performance Stock Option [Member] | Share-Based Payment Arrangement, Tranche One [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 33.33%      
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Month) 3 years 3 years   3 years
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 1,749      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) 1 year 10 months 6 days      
Share-Based Payment Arrangement, Expense $ 780 $ 1,060 $ 309  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 346,790 407,617 1,305,000  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) 508,368 1,025,005 155,000  
Restricted Stock Units (RSUs) [Member] | Share-Based Payment Arrangement, Tranche One [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 33.33% 33.33%   50.00%
Restricted Stock Units (RSUs) [Member] | Share-Based Payment Arrangement, Tranche Two [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage       16.67%
Performance-based Restriced Stock Units [Member]        
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 981      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) 2 years 4 months 28 days      
Share-Based Payment Arrangement, Expense $ 293 $ 156 $ 274  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 241,632 492,950    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) 445,000 222,500 90,001  
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year) 3 years      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Settled in Period (in shares) 757,501      
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture, Total (in shares) 361,122      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period (in shares) 396,379   132,499  
Performance-based Restriced Stock Units [Member] | Global X Uranium ETF [Member]        
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Settled in Period (in shares) 757,501      
Performance-based Restriced Stock Units [Member] | Minimum [Member]        
Share-based Compensation Arrangement By Share-based Payment Award, Percentage Eligible to Vest 0.00%      
Performance-based Restriced Stock Units [Member] | Maximum [Member]        
Share-based Compensation Arrangement By Share-based Payment Award, Percentage Eligible to Vest 200.00%      
The 2020 Stock Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)   0    
The 2020 Stock Incentive Plan [Member] | Performance-based Restriced Stock Units [Member]        
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 120,816 246,475