Note 8 - Employee Benefit Plans (Details Textual) $ in Millions	3 Months Ended
	Mar. 31, 2023 USD ($)
Pension Plan [Member]
Defined Benefit Plan, Benefit Obligation, Payment for Settlement	$ 11.8
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plan, Plan Assets, Contributions by Employer	0.4
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year	1.2
Defined Benefit Plan, Benefit Obligation	$ 17.3