Note 1 - Basis of Preparation of Financial Statements (Details Textual) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
COVID-19 Mitigation Costs	$ 0.1	$ 1.4	$ 0.4	$ 3.0