Note 5 - Defined Benefit Plan (Tables)

6 Months Ended

Jun. 30, 2021

Notes Tables

Schedule of Defined Benefit Plans Disclosures [Table Text Block]

	Pension Benefits
	Three Months Ended June 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
	Six Months Ended June 30,
	2021			2020
Service cost	$	722		$	540
Interest cost		368			410
Expected return on plan assets		(1,110	)		(840	)
Amortization of prior service cost		(6	)		(54	)
Recognized net actuarial loss		416			354
Net periodic benefit cost	$	390		$	410