Note 8 - Leases (Details Textual) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Finance Lease, Liability, Total	$ 4.2
Fixed Assets, Net [Member]
Finance Lease, Right-of-Use Asset, after Accumulated Amortization, Total	10.7	$ 19.0
Short-term Debt and Current Portion of Long-term Debt and Long-term Debt [Member]
Finance Lease, Liability, Total	$ 4.2	$ 13.5
First Option to Extend Corporate Headquarters [Member]
Lessee, Leases, Number of Extensions	1
Lessee, Lease, Extension Lease Term (Year)	10 years	10 years
Second Option to Extend Corporate Headquarters [Member]
Lessee, Leases, Number of Extensions	2
Lessee, Lease, Extension Lease Term (Year)	5 years