Note 12 - Postretirement Medical Benefits (Detail) - Plans Benefit Obligation (Postretirement Medical Benefits [Member], USD $) In Thousands, unless otherwise specified					12 Months Ended
Dec. 31, 2011 Beginning [Member]	Dec. 31, 2010 Beginning [Member]	Dec. 31, 2012 Ending [Member]	Dec. 31, 2011 Ending [Member]	Dec. 31, 2012	Dec. 31, 2011
Obligation at beginning of year	$ 14,294	$ 11,760	$ 15,935	$ 14,294
Service cost					617	432
Interest cost					608	605
Actuarial loss					674	1,750
Participant contributions					85	86
Benefit payments					(343)	(339)
Obligation at end of year	$ 14,294	$ 11,760	$ 15,935	$ 14,294

1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

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-Glossary Projected Benefit Obligation

-URI http://asc.fasb.org/extlink&oid=6522206

+ Details

- Definition

The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

+ References

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+ Details

- 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+ Details

- 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

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

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