Note 7 - Employee Benefits Plans - Estimated Future Benefit Payments (Details) $ in Thousands	Dec. 31, 2017 USD ($)
Deferred Compensation Plan [Member]
2018	$ 404
2019	395
2020	384
2021	368
2022	355
2023 - 2027	1,514
Estimated contributions for 2018	404
Supplemental Employee Retirement Plan [Member]
2018	154
2019	151
2020	147
2021	144
2022	140
2023 - 2027	631
Estimated contributions for 2018	154
Other Postretirement Benefits Plan [Member]
2018	88
2019	84
2020	79
2021	73
2022	67
2023 - 2027	246
Estimated contributions for 2018	$ 88

Amount of benefits for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following latest fiscal year.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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Amount of benefits for defined benefit plan expected to be paid in next fiscal year following latest fiscal year.

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Amount of benefits for defined benefit plan expected to be paid in fifth fiscal year following latest fiscal year.

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Amount of benefits for defined benefit plan expected to be paid in fourth fiscal year following latest fiscal year.

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Amount of benefits for defined benefit plan expected to be paid in third fiscal year following latest fiscal year.

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Amount of benefits for defined benefit plan expected to be paid in second fiscal year following latest fiscal year.

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Amount of contributions expected to be received by defined benefit plan from employer in fiscal year. Excludes contributions paid by employer in current fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2709-114920

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