Note 1 - Description of Business and Basis of Presentation (Details Textual) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2023	Sep. 30, 2022	Jun. 30, 2022
Unrealized Gain (Loss) on Derivatives		$ 460	$ 1,791
Options Held [Member]
Derivative, Underlying Investment, Shares (in shares)	170,448	170,448		207,970
Open Option Contracts, Expiration Period (Month)				24 months
Derivative, Underlying Investment, Shares, Expirations in Period (in shares)	37,522	37,522
Increase (Decrease) in Derivative Liabilities	$ (300)	$ (300)
Derivative, Underlying Investment, Fair Value	1,600	1,600		$ 3,600
Unrealized Gain (Loss) on Derivatives	$ 300	$ 500