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Note 5 - Fair Value Measurements - Assets and Liabilities Carried at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Fair value (millions) $ 3,100 $ 1,200 $ 3,500 $ 2,600 $ 1,300 $ 900 $ 1,100 $ 1,400
Fair Value, Recurring [Member] | Reported Value Measurement [Member]                
Cash equivalents 72,832       7,913      
Fair value (millions) 3,100       1,270      
Fair Value, Recurring [Member] | Reported Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]                
Cash equivalents 72,832       7,913      
Fair value (millions) 0       0      
Fair Value, Recurring [Member] | Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]                
Cash equivalents 0       0      
Fair value (millions) 0       0      
Fair Value, Recurring [Member] | Reported Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]                
Cash equivalents 0       0      
Fair value (millions) $ 3,100       $ 1,270