Note 5 - Defined Benefit Plan (Tables)

9 Months Ended

Sep. 30, 2021

Notes Tables

Schedule of Defined Benefit Plans Disclosures [Table Text Block]

	Pension Benefits
	Three Months Ended September 30,
	2021			2020
Service cost	$	361		$	270
Interest cost		184			205
Expected return on plan assets		(555	)		(420	)
Amortization of prior service cost		(3	)		(27	)
Recognized net actuarial loss		208			177
Net periodic benefit cost	$	195		$	205

	Pension Benefits
	Nine Months Ended September 30,
	2021			2020
Service cost	$	1,083		$	810
Interest cost		552			615
Expected return on plan assets		(1,665	)		(1,260	)
Amortization of prior service cost		(9	)		(81	)
Recognized net actuarial loss		624			531
Net periodic benefit cost	$	585		$	615