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Note 9 - Retirement Plans (Tables) | 12 Months Ended
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Dec. 31, 2014
Note 9 - Retirement Plans (Tables) [Line Items] |
Schedule of Net Funded Status [Table Text Block] |
|  | December 31, |
|  | 2014 |  |  | 2013 |
Change in projected benefit obligation: |  |  |  |  |  |  |  |
Projected benefit obligation at beginning of year |  | $ | 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 end of year |  | $ | 108,006 |  |  | $ | 83,533 |
Change in plan assets: |  |  |  |  |  |  |  |
Fair value of pension plan assets at beginning of year |  | $ | 58,063 |  |  | $ | 46,662 |
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 end of year |  |  | 66,813 |  |  |  | 58,063 |
Funded status of pension plan |  | $ | (41,193 | ) |  | $ | (25,470 | )
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 | )
Schedule of Assumptions Used [Table Text Block] |
|  | Year Ended December 31, |
|  | 2014 |  |  | 2013 |
Weighted-average assumptions used to determine net periodic benefit cost for our active pension plan: |  |  |  |  |  |  |  |
Discount rate |  |  | 4.97 | % |  |  | 4.31 | %
Expected long-term rate of return on pension plan assets |  |  | 7.00 | % |  |  | 7.00 | %
Estimated rate of increase in compensation levels |  |  | 5.63 | % |  |  | 5.63 | %
|  | As of December 31, |
|  | 2014 |  |  | 2013 |
Weighted-average assumptions used to determine benefit obligations: |  |  |  |  |  |  |  |
Discount rate |  |  | 4.00 | % |  |  | 4.97 | %
Estimated rate of increase in compensation levels |  |  | 5.63 | % |  |  | 5.63 | %
Schedule of Net Benefit Costs [Table Text Block] |
|  | Year Ended December 31, |
|  | 2014 |  |  | 2013 |  |  | 2012 |
Components of net periodic pension cost: |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 5,162 |  |  | $ | 5,165 |  |  | $ | 4,452 |
Interest cost |  |  | 4,106 |  |  |  | 3,553 |  |  |  | 3,315 |
Expected return on plan assets |  |  | (4,200 | ) |  |  | (3,400 | ) |  |  | (2,609 | )
Recognized net actuarial loss |  |  | 969 |  |  |  | 3,131 |  |  |  | 2,527 |
Net periodic pension cost |  | $ | 6,037 |  |  | $ | 8,449 |  |  | $ | 7,685 |
Schedule of Expected Benefit Payments [Table Text Block] |
Years |  | Amount |
2015 |  | $ | 1,989 |
2016 |  |  | 2,218 |
2017 |  |  | 2,455 |
2018 |  |  | 2,695 |
2019 |  |  | 3,071 |
2020 | - | 2024 |  |  | 23,153 |
Defined Benefit Plan, Fair Value of Plan Assets [Table Text Block] |
|  | As of December 31, 2014 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance general account |  | $ | - |  |  | $ | 18,598 |  |  | $ | - |  |  | $ | 18,598 |
Cash management accounts |  |  | - |  |  |  | 2,319 |  |  |  | - |  |  |  | 2,319 |
Equity accounts |  |  | - |  |  |  | 42,608 |  |  |  | - |  |  |  | 42,608 |
Fixed income account |  |  | - |  |  |  | 3,288 |  |  |  | - |  |  |  | 3,288 |
Total |  | $ | - |  |  | $ | 66,813 |  |  | $ | - |  |  | $ | 66,813 |
|  | As of December 31, 2013 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance general account |  | $ | - |  |  | $ | 18,759 |  |  | $ | - |  |  | $ | 18,759 |
Cash management accounts |  |  | - |  |  |  | 1,959 |  |  |  | - |  |  |  | 1,959 |
Equity accounts |  |  | - |  |  |  | 34,603 |  |  |  | - |  |  |  | 34,603 |
Fixed income account |  |  | - |  |  |  | 2,742 |  |  |  | - |  |  |  | 2,742 |
Total |  | $ | - |  |  | $ | 58,063 |  |  | $ | - |  |  | $ | 58,063 |
Capital Accumulation Plan [Member] |
Note 9 - Retirement Plans (Tables) [Line Items] |
Defined Contribution Plan Disclosures [Table Text Block] |
|  | Year Ended December 31, |
|  | 2014 |  |  | 2013 |  |  | 2012 |
|  | Shares |  |  | Amount |  |  | Shares |  |  | Amount |  |  | Shares |  |  | Amount |
Matching contributions to the Capital Accumulation Plan |  |  | 2,341 |  |  | $ | 25 |  |  |  | 5,235 |  |  | $ | 28 |  |  |  | 14,293 |  |  | $ | 26 |
Asset Categories [Member] |
Note 9 - Retirement Plans (Tables) [Line Items] |
Schedule of Allocation of Plan Assets [Table Text Block] |
|  | As of December 31, |
|  | 2014 |  |  | 2013 |
Asset category: |  |  |  |  |  |  |  |
Insurance general account |  |  | 28 | % |  |  | 32 | %
Cash management accounts |  |  | 3 | % |  |  | 3 | %
Equity accounts |  |  | 64 | % |  |  | 60 | %
Fixed income account |  |  | 5 | % |  |  | 5 | %
Total |  |  | 100 | % |  |  | 100 | %
Asset Classes [Member] |
Note 9 - Retirement Plans (Tables) [Line Items] |
Schedule of Allocation of Plan Assets [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%

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