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Note 7 - Pension and Other Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 2023

Notes Tables

Schedule of Costs of Retirement Plans [Table Text Block]

		Pension Benefits								Postretirement Benefits
		Three Months Ended September 30,								Three Months Ended September 30,
		2023				2022				2023				2022
Service cost		$	530			$	496			$	209			$	287
Interest cost			635				580				299				190
Expected return on plan assets			(657	)			(665	)			-				-
Amortization of prior service cost			-				-				(249	)			(282	)
Recognized actuarial loss			301				379				(9	)			92
Settlement loss			-				4,759				-				-
Net periodic benefit cost (a)		$	809			$	5,549			$	250			$	287

		Pension Benefits								Postretirement Benefits
		Nine Months Ended September 30,								Nine Months Ended September 30,
		2023				2022				2023				2022
Service cost		$	1,591			$	1,642			$	626			$	860
Interest cost			1,904				1,745				897				570
Expected return on plan assets			(1,971	)			(2,169	)			-				-
Amortization of prior service cost			-				-				(746	)			(847	)
Recognized actuarial loss			902				1,314				(28	)			276
Settlement loss			-				6,355				-				-
Net periodic benefit cost (a)		$	2,426			$	8,887			$	749			$	859