Note 9 - Postretirement Medical Benefits (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015
Note 9 - Postretirement Medical Benefits (Details) [Line Items]
Employee Service Requirement	20 years
Employee Age Requirement	55 years
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year	$ 359
Other Postretirement Benefits Payments	$ 71
Plan 1 [Member]
Note 9 - Postretirement Medical Benefits (Details) [Line Items]
Company Contributions Plan 1	100.00%
Plan 2 [Member]
Note 9 - Postretirement Medical Benefits (Details) [Line Items]
Contributions Plan 2	50.00%

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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- Details

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- Definition

Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period.

+ References

No definition available.

+ 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=31042434&loc=d3e3536-108585

+ Details

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- Details

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- Details

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