Note 2 - Fair Value of Financial Instruments - Summary of Fair Value Maturities for Financial Asset (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Assets, fair value	$ 23,088
Cash equivalents and marketable securities, less than 1 year	23,088
Cash equivalents and marketable securities, 1-5 years	0
Cash equivalents and marketable securities, 5-10 years	0
Cash equivalents and marketable securities, more than 10 years	$ 0