Note 9 - Non-pension Post-retirement Benefits - Assumptions (Details) - Non-Pension Post-retirement Benefit Plans [Member]	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
UNITED STATES
Discount rate	4.27%	3.60%
Discount rate	3.41%	4.27%
Healthcare cost trend rate assumed for next year	6.00%	6.25%
Ultimate healthcare trend rate	4.50%	5.00%
Year the ultimate healthcare trend rate is reached	2026	2024
Foreign Plan [Member]
Discount rate	3.52%	3.26%
Discount rate	2.92%	3.52%
Healthcare cost trend rate assumed for next year	6.00%	6.25%
Ultimate healthcare trend rate	5.00%	5.00%
Year the ultimate healthcare trend rate is reached	2024	2024

Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

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-Publisher FASB
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-Section 50
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Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan.

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Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status.

+ References

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Ultimate trend rate for health care cost for defined benefit postretirement plan.

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Year ultimate health care cost trend rate is expected to be reached, in CCYY format.

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