Note 7 - Employee Benefit Plans - Net Periodic Benefit Costs (Details) (Parentheticals)	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2023
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	General and Administrative Expense	General and Administrative Expense