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Note 3 - Fair Value Measurements - Instruments by Significant Investment Category (Details) - Fair Value, Inputs, Level 1 [Member] - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Adjusted Cost $ 23,185 $ 31,659
Unrealized Gains 62 0
Unrealized Losses 0 (6)
Market Value 23,247 31,653
Money Market Fund [Member]    
Adjusted Cost 3,382 1,670
Unrealized Gains 0 0
Unrealized Losses 0 0
Market Value 3,382 1,670
US Treasury Securities in Short-term Investments [Member]    
Adjusted Cost 19,803 29,989
Unrealized Gains 62 0
Unrealized Losses 0 (6)
Market Value $ 19,865 $ 29,983