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Note 7 - Fair Value Measurements - Assets and Liabilities Carried at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Fair value (millions) $ 1,100 $ 1,400 $ 1,200 $ 2,600 $ 4,700 $ 7,200 $ 7,100
Fair Value, Recurring [Member] | Reported Value Measurement [Member]              
Cash equivalents 9,894   17,641        
Fair value (millions) 1,080   1,200        
Fair Value, Recurring [Member] | Reported Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]              
Cash equivalents 9,894   17,641        
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) $ 1,080   $ 1,200