Note 12 - Pension and Other Postretirement Benefit Plans - Benefit Payments Under the Director Plan, Which Reflect Expected Future Service, Expected to be Paid (Details) $ in Thousands	Dec. 31, 2016 USD ($)
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months	$ 1,190
2018	1,183
2019	1,197
2020	1,197
2021	1,239
2022 – 2026	6,561
Directors' Plan [Member]
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months	288
2018	272
2019	288
2020	288
2021	288
2022 – 2026	$ 1,148

Amount of benefits from a defined benefit plan expected to be paid in the five fiscal years after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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=65897934&loc=d3e1928-114920

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Amount of benefits from a defined benefit plan expected to be paid in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of benefits from a defined benefit plan expected to be paid in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of benefits from a defined benefit plan expected to be paid in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of benefits from a defined benefit plan expected to be paid in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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