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Note 5 - Fair Value Measurements - Fair Value of Financial Instruments (Details) - Money Market Funds [Member] - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Estimate of Fair Value Measurement [Member]
Cash equivalents	$ 39,892	$ 46,061
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Cash equivalents	39,892	46,061
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	$ 39,892	$ 46,061