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Note 5 - Leases (Details Textual) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Lessee, Lease, Option to Extend (Year) 20 years  
Finance Lease, Right-of-Use Asset, after Accumulated Amortization, Total $ 20.8 $ 27.1
Finance Lease, Liability, Total $ 14.4 $ 24.7