Note 3 - Investments (Additional Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Schedule of Investments [Line Items]
Non-current investments	$ 33.9	$ 33.7
Carrying value of non-current investments	0.7	1.4
Equity Method Investments	0.1
Equity Losses	$ 0.7	0.3
Payments to acquire marketable securities		9.0
Unrealized losses on investment		$ 0.2	$ 5.6