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Note 3 - Periodic Pension Expense - Net Periodic Benefit Cost (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Service cost - benefits earned during the period	$ 27	$ 16
Interest cost on projected benefit obligation	242	241
Expected return on plan assets	(429)	(304)
Recognized actuarial loss	283	277
Net periodic pension cost	$ 123	$ 230

X

- Definition

Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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- Definition

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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