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Note 4 - Fair Value Measurements - Fair Value of Financial Instruments (Details) - Money Market Funds [Member] - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Estimate of Fair Value Measurement [Member]
Cash equivalents	$ 45,538	$ 55,485
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Cash equivalents	45,538	55,485
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member]
Cash equivalents	0	0
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 3 [Member]
Cash equivalents	0	0
Reported Value Measurement [Member]
Cash equivalents	$ 45,538	$ 55,485