Note 12 - Postretirement Medical Benefits (Detail) - The Following Disclosures of the Net Periodic Benefit Cost Components (Postretirement Medical Benefits [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Postretirement Medical Benefits [Member]
Service cost	$ 617	$ 432
Interest cost	608	605
Amortization of transition obligation	102	102
Recognized prior service cost	257	257
Amortization of net actuarial loss	56
Net periodic benefit cost	$ 1,640	$ 1,396
Major assumptions:
Discount rate used to determine net periodic benefit cost	4.39%	5.55%
Discount rate used to determine benefit obligation as of year end	4.03%	4.39%
Retiree participation rate (Plan 1)	100.00%	100.00%
Retiree participation rate (Plan 2)	72.00%	72.00%

Note 12 - Postretirement Medical Benefits (Detail) - The Following Disclosures of the Net Periodic Benefit Cost Components (Postretirement Medical Benefits [Member], USD $)
In Thousands, unless otherwise specified

12 Months Ended

Dec. 31, 2012

Dec. 31, 2011

Postretirement Medical Benefits [Member]

Service cost

$ 617

$ 432

Interest cost

608

605

Amortization of transition obligation

102

Recognized prior service cost

257

Amortization of net actuarial loss

Net periodic benefit cost

$ 1,640

$ 1,396

Major assumptions:

Discount rate used to determine net periodic benefit cost

4.39%

5.55%

Discount rate used to determine benefit obligation as of year end

4.03%

4.39%

Retiree participation rate (Plan 1)

100.00%

Retiree participation rate (Plan 2)

72.00%

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Percent of eligible participants that elected to participate in plan 1

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

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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.

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

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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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.

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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

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-Name Statement of Financial Accounting Standard (FAS)

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

-Publisher FASB

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-Number 106

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef

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