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Note 12 - Pension and Other Postretirement Benefit Plans (Details) - Assumptions Used to Determine the Retirement Plan’s Benefit Obligations - Retirement Plan [Member]	Dec. 31, 2015	Dec. 31, 2014
Note 12 - Pension and Other Postretirement Benefit Plans (Details) - Assumptions Used to Determine the Retirement Plan’s Benefit Obligations [Line Items]
Weighted average discount rate	4.06%	3.76%
Rate of increase in future compensation levels
Expected long-term rate of return on assets	7.25%	7.50%

X

- Definition

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

+ References

No definition available.

+ Details

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- References

No definition available.

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- Definition

The interest rate used to adjust for the time value of money for the plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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X

- Definition

Expected rate of compensation increases (for pay-related plans).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(2)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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