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Note 2 - Acquisitions (Details Textual) - USD ($)
$ in Millions
9 Months Ended
Mar. 01, 2021
Apr. 14, 2020
Feb. 05, 2020
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2021
Payments to Acquire Businesses, Gross       $ 18 $ 6  
Proceeds from Sale of Interest to Minority Shareholders         $ 7  
Hydro-Québec [Member]            
Proceeds from Sale of Interest to Minority Shareholders   $ 9        
Proceeds on Loan from Counterparty Related to Sale of Interest to Minority Shareholders   $ 2        
Ashwoods [Member] | Hydro-Québec [Member]            
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners   45.00%       45.00%
Pi Innovo Holdings Limited [Member]            
Business Acquisition, Percentage of Voting Interests Acquired 51.00%          
Business Combination, Step Acquisition, Equity Interest in Acquiree, including Subsequent Acquisition, Percentage, Total 100.00%          
Business Combination, Consideration Transferred, Total $ 35          
Payments to Acquire Businesses, Gross 18          
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value $ 17          
Curtis Investment's Interest in Ashwoods Innovations Limited [Member]            
Business Acquisition, Percentage of Voting Interests Acquired     35.40%      
Business Combination, Consideration Transferred, Total     $ 22      
Payments to Acquire Businesses, Gross     $ 8      
Ownership percentage     97.80%      
Equity Method Investments, Effective Settlement of Pre-existing Loan Payable     $ 4      
Curtis Investment's Interest in Ashwoods Innovations Limited [Member] | Other Operating Income (Expense) [Member]            
Equity Method Investment, Gain (loss) to Other Income (Expense), Net     3      
Investment in Ashwoods [Member]            
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value     $ 10