Note 3 - Revenue Recognition 1 (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Contract with Customer, Liability, Revenue Recognized	$ 0.2	$ 0.2
Accounts Receivable, Allowance for Credit Loss	$ 1.6		$ 1.6