Note 1 - Description of Business, Basis of Presentation and Summary of Accounting Policies (Details Textual) - Options Held [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Jun. 30, 2022
Derivative, Underlying Investment, Shares (in shares)	132,924	207,970
Derivative, Underlying Investment, Fair Value	$ 1.8	$ 3.6
Open Option Contracts, Expiration Period (Month)	24 months
Increase (Decrease) in Derivative Liabilities	$ (2.4)