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Note 7 - Pension and Other Postretirement Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Pension Plan [Member]
Service cost	$ 535	$ 602	$ 1,102	$ 1,295
Interest cost	581	632	1,227	1,238
Expected return on plan assets	(836)	(1,103)	(1,781)	(2,307)
Amortization of prior service cost
Recognized actuarial loss (gain)	472	421	863	818
Settlement loss		2,229		2,616
Net periodic benefit cost (a)	752	2,781	1,411	3,660
Postemployment Retirement Benefits [Member]
Service cost	270	194	541	388
Interest cost	236	141	471	282
Expected return on plan assets
Amortization of prior service cost	(282)	(282)	(564)	(565)
Recognized actuarial loss (gain)	7	(104)	14	(207)
Settlement loss
Net periodic benefit cost (a)	$ 231	$ (51)	$ 462	$ (102)

X

- Definition

Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan.

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Amount, before tax, after reclassification adjustment, of increase (decrease) in accumulated other comprehensive income from gain (loss) of defined benefit plan.

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Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

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Amount of cost recognized for passage of time related to defined benefit plan.

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Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement.

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