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Note 11 - Pension Plan and Other Postretirement Benefits - Funded Status (Details) - Pension Plan [Member] - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Benefit Obligation	$ (346,723)	$ (297,972)
Projected Benefit Obligation Liability – Net Amount Recognized	(384,785)	(328,442)	$ (352,718)
Fair Value of Plan Assets	329,781	269,783	$ 285,319
Funded Status	$ (55,004)	$ (58,659)

X

- Definition

Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

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

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status.

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