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Note 13 - Income Taxes and Deferred Income Taxes (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 22, 2017
May 31, 2024
May 31, 2023
May 31, 2022
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 35.00% 21.00%    
Unrecognized Tax Benefits   $ 0 $ 0 $ 0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense   0 0 $ 0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued   0 0  
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]        
SEC Schedule, 12-09, Valuation Allowances and Reserves, Period Increase (Decrease)   164,471 $ 271,297  
Domestic Tax Jurisdiction [Member]        
Operating Loss Carryforwards   $ 497,033    
Net Operating Loss Carryforwards Offset, Percentage Of Taxable Income   80.00%    
Domestic Tax Jurisdiction [Member] | Internal Revenue Service (IRS) [Member]        
Open Tax Year   2020 2021 2022 2023    
Foreign Tax Jurisdiction [Member] | Canada Revenue Agency [Member]        
Operating Loss Carryforwards   $ 662,839    
Open Tax Year   2018 2019 2020 2021 2022 2023    
Foreign Tax Jurisdiction [Member] | Portuguese Tax Authority [Member]        
Open Tax Year   2019 2020 2021 2022 2023    
Foreign Tax Jurisdiction [Member] | Federal Ministry of Finance, Germany [Member]        
Open Tax Year   2018 2019 2020 2021 2022 2023    
Foreign Tax Jurisdiction [Member] | Australian Taxation Office [Member]        
Open Tax Year   2019 2020 2021 2022 2023