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Note 6 - Fair Value Measurements - Assets and Liabilities Carried at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Fair value (millions) $ 3,500 $ 2,600 $ 1,300 $ 900 $ 1,100 $ 1,400 $ 1,200
Fair Value, Recurring [Member] | Reported Value Measurement [Member]              
Cash equivalents 5,157   7,913        
Fair value (millions) 3,470   1,270        
Fair Value, Recurring [Member] | Reported Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]              
Cash equivalents 5,157   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) $ 3,470   $ 1,270