Note 3 - Revenue Recognition 1 (Details Textual) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Contract with Customer, Liability, Revenue Recognized	$ 0.3	$ 0.2	$ 0.5	$ 0.4
Accounts Receivable, Allowance for Credit Loss, Ending Balance	$ 1.5		$ 1.5		$ 1.7