Note 13 - Postretirement Medical Benefits (Details) - Net Periodic Benefit Cost (Postretirement Medical Benefits [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Postretirement Medical Benefits [Member]
Note 13 - Postretirement Medical Benefits (Details) - Net Periodic Benefit Cost [Line Items]
Service cost	$ 482	$ 630
Interest cost	569	551
Recognized prior service cost	207	257
Amortization of net actuarial gain	(63)	0
Net periodic benefit cost	$ 1,195	$ 1,438
Major assumptions:
Discount rate used to determine net periodic benefit cost	4.93%	4.03%
Discount rate used to determine benefit obligation as of year end	3.92%	4.93%
Retiree participation rate (Plan 1)	100.00%	100.00%
Retiree participation rate (Plan 2)	72.00%	72.00%

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- Definition

Retiree participation rate (Plan 1)

+ References

No definition available.

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- Definition

Retiree participation rate (Plan 2)

+ References

No definition available.

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- Definition

The amount of gains or losses recognized in net periodic benefit cost.

+ References

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- Definition

The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

+ References

+ Details

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- Definition

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

+ References

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- Definition

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

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- Definition

The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

+ References

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- Definition

The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

+ References

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- Definition

The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of 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 (h)(1)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Service Cost (Component of Net Periodic Pension Cost)

-URI http://asc.fasb.org/extlink&oid=6525008

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

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