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Note 9 - Retirement Plans (Tables) | 12 Months Ended
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Dec. 31, 2012
Schedule of Net Funded Status [Table Text Block] |
|  | December 31, |
|  | 2012 |  |  | 2011 |
Change in projected benefit obligation: |  |  |  |  |  |
Projected benefit obligation at beginning of year |  | $ | 67,033 |  |  | $ | 50,055 |
Service cost |  |  | 4,452 |  |  |  | 3,447 |
Interest cost |  |  | 3,315 |  |  |  | 2,943 |
Actuarial losses |  |  | 9,546 |  |  |  | 11,521 |
Benefits paid |  |  | (1,110 | ) |  |  | (933 | )
Projected benefit obligation at end of year |  | $ | 83,236 |  |  | $ | 67,033 |
Change in plan assets: |  |  |  |  |  |  |  |
Fair value of pension plan assets at beginning of year |  | $ | 35,011 |  |  | $ | 33,039 |
Actual return on plan assets |  |  | 3,728 |  |  |  | 275 |
Company contributions |  |  | 9,033 |  |  |  | 2,630 |
Benefits paid |  |  | (1,110 | ) |  |  | (933 | )
Fair value of pension plan assets at end of year |  |  | 46,662 |  |  |  | 35,011 |
Funded status of pension plan |  | $ | (36,574 | ) |  | $ | (32,022 | )
Amounts recognized in our balance sheets consist of: |  |  |  |  |  |  |  |
Accrued benefit cost |  | $ | (6,336 | ) |  | $ | (7,684 | )
Accumulated other comprehensive income |  |  | (30,238 | ) |  |  | (24,338 | )
Net liability recognized |  | $ | (36,574 | ) |  | $ | (32,022 | )
Schedule of Assumptions Used [Table Text Block] |
|  | Year Ended December 31, |
|  | 2012 |  |  | 2011 |
Weighted-average assumptions used to determine net periodic benefit cost for our active pension plan: |  |  |  |  |  |
Discount rate |  |  | 4.84 | % |  |  | 5.85 | %
Expected long-term rate of return on pension plan assets |  |  | 7.00 | % |  |  | 7.00 | %
Estimated rate of increase in compensation levels |  |  | 5.63 | % |  |  | 5.00 | %
|  | As of December 31, |
|  | 2012 |  |  | 2011 |
Weighted-average assumptions used to determine benefit obligations: |  |  |  |
Discount rate |  |  | 4.31 | % |  |  | 4.84 | %
Estimated rate of increase in compensation levels |  |  | 5.63 | % |  |  | 5.63 | %
Schedule of Net Benefit Costs [Table Text Block] |
|  | Year Ended December 31, |  |  |  |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Components of net periodic pension cost: |  |  |  |  |  |  |  |  |
Service cost |  | $ | 4,452 |  |  | $ | 3,447 |  |  | $ | 3,199 |
Interest cost |  |  | 3,315 |  |  |  | 2,943 |  |  |  | 2,658 |
Expected return on plan assets |  |  | (2,609 | ) |  |  | (2,351 | ) |  |  | (1,987 | )
Recognized net actuarial loss |  |  | 2,527 |  |  |  | 958 |  |  |  | 912 |
Net periodic pension cost |  | $ | 7,685 |  |  | $ | 4,997 |  |  | $ | 4,782 |
Schedule of Expected Benefit Payments [Table Text Block] |
Years |  | Amount |
2013 |  | $ | 1,594 |
2014 |  |  | 1,724 |
2015 |  |  | 1,879 |
2016 |  |  | 2,051 |
2017 |  |  | 2,203 |
2018 - 2022 |  |  | 14,625 |
Schedule of Allocation of Plan Assets [Table Text Block] |
|  | As of December 31, |
|  | 2012 |  |  | 2011 |
Asset category: |  |  |  |  |  |
Insurance general account |  |  | 37 | % |  |  | 38 | %
Cash management accounts |  |  | 3 | % |  |  | 3 | %
Equity accounts |  |  | 54 | % |  |  | 53 | %
Fixed income account |  |  | 6 | % |  |  | 6 | %
Total |  |  | 100 | % |  |  | 100 | %
Schedule of Changes in Projected Benefit Obligations [Table Text Block] |
|  | Target Range
Asset class: |  |  |  |
Large cap equities |  | 23% | to | 91%
Mid cap equities |  | 0% | to | 15%
Small cap equities |  | 0% | to | 16%
International equities |  | 5% | to | 25%
Fixed income |  | 0% | to | 30%
Cash |  | 0% | to | 20%
Schedule of Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block] |
|  | As of December 31, 2012 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Insurance general account |  | $ | - |  |  | $ | 17,381 |  |  | $ | - |  |  | $ | 17,381 |
Cash management accounts |  |  | - |  |  |  | 1,457 |  |  |  | - |  |  |  | 1,457 |
Equity accounts |  |  | - |  |  |  | 24,911 |  |  |  | - |  |  |  | 24,911 |
Fixed income account |  |  | - |  |  |  | 2,913 |  |  |  | - |  |  |  | 2,913 |
Total |  | $ | - |  |  | $ | 46,662 |  |  | $ | - |  |  | $ | 46,662 |
|  | As of December 31, 2011 |  |  |  |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Insurance general account |  | $ | - |  |  | $ | 13,335 |  |  | $ | - |  |  | $ | 13,335 |
Cash management accounts |  |  | - |  |  |  | 846 |  |  |  | - |  |  |  | 846 |
Equity accounts |  |  | - |  |  |  | 18,668 |  |  |  | - |  |  |  | 18,668 |
Fixed income account |  |  | - |  |  |  | 2,162 |  |  |  | - |  |  |  | 2,162 |
Total |  | $ | - |  |  | $ | 35,011 |  |  | $ | - |  |  | $ | 35,011 |
Capital Accumulation Plan [Member] |
Schedule of Changes in Projected Benefit Obligations [Table Text Block] |
|  | Year Ended December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
|  | Shares |  |  | Amount |  |  | Shares |  |  | Amount |  |  | Shares |  |  | Amount |
Matching contributions to the Capital Accumulation Plan |  |  | 14 |  |  | $ | 26 |  |  |  | 14 |  |  | $ | 29 |  |  |  | 14 |  |  | $ | 29 |

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