Note 5 - Accounts Receivable (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounts Receivable, Allowance for Credit Loss, Current	$ 4.2	$ 4.3
Accounts Receivable, Credit Loss Expense (Reversal)	$ 0.4	$ 2.2	$ 1.3