Note 9 - Retirement Plans (Details) - Summary of Net Funded Status (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Change in projected benefit obligation:
Service cost	$ 5,162us-gaap_DefinedBenefitPlanServiceCost	$ 5,165us-gaap_DefinedBenefitPlanServiceCost	$ 4,452us-gaap_DefinedBenefitPlanServiceCost
Interest cost	4,106us-gaap_DefinedBenefitPlanInterestCost	3,553us-gaap_DefinedBenefitPlanInterestCost	3,315us-gaap_DefinedBenefitPlanInterestCost
Change in plan assets:
Fair value of pension plan assets at	58,063
Fair value of pension plan assets at	66,813	58,063
Active Defined Benefit Pension Plan [Member]
Change in projected benefit obligation:
Projected benefit obligation at	83,533	83,236
Service cost	5,162	5,165
Interest cost	4,106	3,553
Actuarial losses (gains)	16,712	(7,158)
Benefits paid	(1,507)	(1,263)
Projected benefit obligation at	108,006	83,533
Change in plan assets:
Fair value of pension plan assets at	58,063	46,662
Funded status of pension plan	(41,193)	(25,470)
Actual return on plan assets	3,940	8,216
Company contributions	6,317	4,448
Benefits paid	(1,507)	(1,263)
Fair value of pension plan assets at	66,813	58,063
Amounts recognized in our balance sheets consist of:
Accrued benefit cost	(10,057)	(10,337)
Accumulated other comprehensive income	(31,136)	(15,133)
Net liability recognized	$ (41,193)	$ (25,470)

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The pretax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

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-Name Accounting Standards Codification

-Glossary Actual Return on Plan Assets (Component of Net Periodic Postretirement Benefit Cost)

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Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan.

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-Glossary Gain or Loss

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The aggregate net amount recognized in the balance sheet associated with the defined benefit plan(s). Will normally be the same as the Defined Benefit Plan, Funded Status of Plan, Total.

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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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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.

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The increase in the fair value of plan assets from contributions made by the employer.

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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total.

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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.

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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.

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This represents the entire liability recognized in the balance sheet that is associated with the defined benefit plans.

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