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Note 15 - Pension Plan - Amounts Recognized in Balance Sheet (Details) - Pension Plan [Member] - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Present value of accumulated benefit obligation	$ (37,925)	$ (40,142)
Effect of future compensation increases	(1,049)	(2,226)
Present value of projected benefit obligation	(38,975)	(42,368)	$ (36,659)
Fair value of plan assets	37,177	38,813	$ 33,016
Net liability for pension benefits	$ (1,797)	$ (3,555)

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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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