Note 10 - Postretirement Medical Benefits (Details Textual) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)
Plan 2 [Member]
Employee Service Requirement		20 years
Employee Age Requirement		55 years
Contributions Plan 2	50.00%	50.00%
Plan 1 [Member]
Company Contributions Plan 1	100.00%	100.00%
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year		$ 393
Other Postretirement Benefits Payments	$ 78	$ 158

Percentage of employee contributions paid by the company related to postretirement benefits identified as Plan 1.

No definition available.

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- Definition

Percentage of contributions paid by the company and the employee related to postretirement benefits identified as Plan 2.

+ References

No definition available.

+ Details

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- Definition

Minimum age requirement upon retirement to be eligible for postretirement medical benefits.

+ References

No definition available.

+ Details

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- Definition

Years of full time service required to be eligible for postretirement medical benefits.

+ References

No definition available.

+ Details

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- Definition

Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position.

+ 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 (g)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of cash or cash equivalents contributed during the reporting period by the entity to fund non-pension postretirement benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3536-108585

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- Details

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