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Note 7 - Pension and Other Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 2021

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,
		2021				2020				2021				2020
Service cost		$	636			$	688			$	365			$	343
Interest cost			467				431				163				194
Expected return on plan assets			(907	)			(984	)			-				-
Amortization of prior service cost			-				-				(282	)			(282	)
Recognized actuarial loss			423				538				145				77
Settlement loss			388				991				-				-
Net periodic benefit cost (a)		$	1,007			$	1,664			$	391			$	332

		Pension Benefits								Postretirement Benefits
		Nine Months Ended September 30,								Nine Months Ended September 30,
		2021				2020				2021				2020
Service cost		$	2,034			$	2,029			$	1,096			$	1,029
Interest cost			1,252				1,522				490				584
Expected return on plan assets			(2,707	)			(2,928	)			-				-
Amortization of prior service cost			-				-				(847	)			(847	)
Recognized actuarial loss			1,482				1,673				435				230
Settlement loss			2,116				4,373				-				-
Net periodic benefit cost (a)		$	4,177			$	6,669			$	1,174			$	996