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Note 10 - Contingencies (Details Textual)
$ in Millions
1 Months Ended 2 Months Ended 20 Months Ended
Sep. 06, 2024
Aug. 06, 2024
Mar. 18, 2024
Jul. 05, 2022
Jun. 30, 2022
Feb. 28, 2025
USD ($)
Oct. 26, 2021
Jun. 20, 2023
Jun. 20, 2023
Mar. 31, 2025
USD ($)
Estimated Litigation Liability                   $ 3
Violations of Federal Securities Laws [Member]                    
Loss Contingency, New Claims Filed, Number         1   4      
Shareholder Derivative Actions, Texas Court [Member]                    
Loss Contingency, New Claims Filed, Number               2 4  
Shareholder Derivative Actions, Texas State Court Member                    
Loss Contingency, New Claims Filed, Number               1    
Shareholder Derivative Actions, Delaware Court [Member]                    
Loss Contingency, New Claims Filed, Number               1    
Shareholder Derivative Actions [Member]                    
Loss Contingency, New Claims Filed, Number 2   2 3            
Legal Fees           $ 1        
Anti-SLAPP Lawsuit [Member]                    
Number of Former Employees   2