Note 5 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Total Assets	$ 3,255	$ 4,212
Fair Value, Inputs, Level 1 [Member]
Total Assets	3,255	4,212
Money Market Funds [Member]
Cash equivalents	3,255	4,212
Money Market Funds [Member] \| Fair Value, Inputs, Level 1 [Member]
Cash equivalents	$ 3,255	$ 4,212

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