Note 7 - Employee Benefit Plans (Details Textual) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 0.3	$ 0.4	$ 0.2
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year	0.9
Defined Benefit Plan, Benefit Obligation	15.7		$ 16.3
Pension Plan [Member]
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year	$ 1.0