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Note 7 - Pension and Other Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2022

Notes Tables

Schedule of Costs of Retirement Plans [Table Text Block]

		Pension Benefits								Postretirement Benefits
		Three Months Ended June 30,								Three Months Ended June 30,
		2022				2021				2022				2021
Service cost		$	482			$	649			$	287			$	365
Interest cost			711				394				190				163
Expected return on plan assets			(692	)			(906	)			-				-
Amortization of prior service cost							-				(283	)			(282	)
Recognized actuarial loss			481				544				92				145
Settlement loss			1,597				1,728								-
Net periodic benefit cost (a)		$	2,579			$	2,409			$	286			$	391

		Pension Benefits								Postretirement Benefits
		Six Months Ended June 30,								Six Months Ended June 30,
		2022				2021				2022				2021
Service cost		$	1,146			$	1,398			$	573			$	731
Interest cost			1,165				785				380				327
Expected return on plan assets			(1,504	)			(1,800	)			-				-
Amortization of prior service cost							-				(565	)			(565	)
Recognized actuarial loss			935				1,059				184				290
Settlement loss			1,597				1,728								-
Net periodic benefit cost (a)		$	3,339			$	3,170			$	572			$	783