Note 10 - Fair Value of Financial Instruments - Assets and Liabilities Measured on Recurring Basis (Details) - Fair Value, Recurring [Member] - Money Market Funds [Member] - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Money market account	$ 91,957	$ 102,681
Fair Value, Inputs, Level 1 [Member]
Money market account	91,957	102,681
Fair Value, Inputs, Level 2 [Member]
Money market account	0	0
Fair Value, Inputs, Level 3 [Member]
Money market account	$ 0	$ 0

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant