Note 6 - Pension and Other Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 2024

Notes Tables

Schedule of Costs of Retirement Plans [Table Text Block]

	Pension Benefits						Postretirement Benefits
	Three Months Ended March 31,						Three Months Ended March 31,
	2024			2023			2024			2023
Service cost	$	502		$	530		$	212		$	208
Interest cost		669			635			286			299
Expected return on plan assets		(839	)		(657	)		-			-
Amortization of prior service cost		-			-			-			(248	)
Recognized actuarial loss (gain)		331			301			(8	)		(9	)
Net periodic benefit cost (a)	$	663		$	809		$	490		$	250