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Note 6 - Revenue (Details Textual) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Contract with Customer, Liability, Revenue Recognized $ 1.0 $ 3.2 $ 8.9 $ 4.3
Other Current Liabilities [Member]        
Contract with Customer, Liability, Current $ 12.6   $ 12.6