Note 1 - Description of Business and Basis of Presentation (Details Textual) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)
Unrealized Gain (Loss) on Derivatives		$ 1,791	$ (0)
Retained Earnings (Accumulated Deficit), Total	$ 123,058	123,058			$ 163,836
Cumulative Effect, Period of Adoption, Adjustment [Member]
Retained Earnings (Accumulated Deficit), Total	$ (100)	$ (100)
Put Option [Member]
Open Option Contracts Written, Number of Shares	207,970	207,970		207,970
Open Option Contracts, Expiration Period (Month)				24 months
Open Option Contracts Written, at Fair Value	$ 1,800	$ 1,800		$ 3,600
Unrealized Gain (Loss) on Derivatives	$ 1,800	$ 1,800