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Note 7 - Pension and Other Postretirement Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Pension Plan [Member]
Service cost	$ 693	$ 752
Interest cost	606	668
Expected return on plan assets	(1,204)	(1,196)
Amortization of prior service cost
Recognized actuarial loss (gain)	397	490
Settlement loss	387	1,680
Net periodic benefit cost	879	2,394
Postretirement Plan [Member]
Service cost	194	312
Interest cost	141	203
Expected return on plan assets
Amortization of prior service cost	(283)
Recognized actuarial loss (gain)	(103)	(168)
Settlement loss
Net periodic benefit cost	$ (51)	$ 347

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 net periodic benefit cost (credit) for defined benefit plan.

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Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Amount of (increase) decrease to benefit obligation of defined benefit plan from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Includes, but is not limited to, lump-sum cash payment to participant in exchange for right to receive specified benefits, purchase of nonparticipating annuity contract and change from remeasurement.

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