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Note 8 - Retirement Plans (Tables) | 12 Months Ended
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Dec. 31, 2015
Capital Accumulation Plan [Member] |
Notes Tables |
Defined Contribution Plan Disclosures [Table Text Block] |
|  | Year Ended December 31, |
|  | 2015 |  |  | 2014 |  |  | 2013 |
|  | Shares |  |  | Amount |  |  | Shares |  |  | Amount |  |  | Shares |  |  | Amount |
Matching contributions to the Capital Accumulation Plan |  |  | 1,898 |  |  | $ | 26 |  |  |  | 2,341 |  |  | $ | 25 |  |  |  | 5,235 |  |  | $ | 28 |
Asset Classets [Member] |
Notes Tables |
Schedule of Allocation of Plan Assets [Table Text Block] |
|  | Target Range |
|  | Strategic Allocation |  | Lower Limit |  | Upper Limit |
Asset class: |  |  |  |  |  |  |
Equities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Large cap value |  |  | 5% |  |  |  |  | 0% |  |  |  | 50% |  |
Large cap blend |  |  | 5% |  |  |  |  | 0% |  |  |  | 50% |  |
Large cap growth |  |  | 5% |  |  |  |  | 0% |  |  |  | 50% |  |
Mid-cap blend |  |  | 15% |  |  |  |  | 0% |  |  |  | 40% |  |
Small cap core |  |  | 5% |  |  |  |  | 0% |  |  |  | 25% |  |
Foreign large blend |  |  | 10% |  |  |  |  | 0% |  |  |  | 40% |  |
Emerging markets |  |  | 10% |  |  |  |  | 0% |  |  |  | 25% |  |
Real estate |  |  | 5% |  |  |  |  | 0% |  |  |  | 20% |  |
Fixed Income: |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury inflation protected |  |  | 5% |  |  |  |  | 0% |  |  |  | 25% |  |
Intermediate term bond |  |  | 10% |  |  |  |  | 0% |  |  |  | 50% |  |
Long term government bond |  |  | 5% |  |  |  |  | 0% |  |  |  | 40% |  |
Hight yield bond |  |  | 10% |  |  |  |  | 0% |  |  |  | 25% |  |
Emerging markets bond |  |  | 10% |  |  |  |  | 0% |  |  |  | 20% |  |
Money market taxable |  |  | 0% |  |  |  |  | 0% |  |  |  | 100% |  |
Asset Categories [Member] |
Notes Tables |
Schedule of Allocation of Plan Assets [Table Text Block] |
|  | As of December 31, |
|  | 2015 |  |  | 2014 |
Asset category: |  |  |  |  |  |  |  |  |  |
Insurance general account |  |  | 26% |  |  |  |  | 28% |  |
Cash management accounts |  |  | 2% |  |  |  |  | 3% |  |
Equity accounts |  |  | 54% |  |  |  |  | 64% |  |
Fixed income accounts |  |  | 14% |  |  |  |  | 5% |  |
Real estate accounts |  |  | 4% |  |  |  |  | 0% |  |
Total |  |  | 100% |  |  |  |  | 100% |  |
Schedule of Net Funded Status [Table Text Block] |
|  | December 31, |
|  | 2015 |  |  | 2014 |
Change in projected benefit obligation: |  |  |  |  |  |  |  |
Projected benefit obligation at beginning of year |  | $ | 108,006 |  |  | $ | 83,533 |
Service cost |  |  | 3,130 |  |  |  | 5,162 |
Interest cost |  |  | 4,159 |  |  |  | 4,106 |
Actuarial losses |  |  | 420 |  |  |  | 16,712 |
Benefits paid |  |  | (1,683 | ) |  |  | (1,507 | )
Effect of pension curtailment |  |  | (10,833 | ) |  |  | - |
Projected benefit obligation at end of year |  | $ | 103,199 |  |  | $ | 108,006 |
Change in plan assets: |  |  |  |  |  |  |  |
Fair value of pension plan assets at beginning of year |  | $ | 66,813 |  |  | $ | 58,063 |
Actual return on plan assets |  |  | (1,034 | ) |  |  | 3,940 |
Company contributions |  |  | 5,150 |  |  |  | 6,317 |
Benefits paid |  |  | (1,683 | ) |  |  | (1,507 | )
Fair value of pension plan assets at end of year |  |  | 69,246 |  |  |  | 66,813 |
Funded status of pension plan |  | $ | (33,953 | ) |  | $ | (41,193 | )
Amounts recognized in our balance sheets consist of: |  |  |  |  |  |  |  |
Accrued benefit cost |  | $ | (8,994 | ) |  | $ | (10,057 | )
Accumulated other comprehensive loss |  |  | (24,959 | ) |  |  | (31,136 | )
Net liability recognized |  | $ | (33,953 | ) |  | $ | (41,193 | )
Schedule of Assumptions Used [Table Text Block] |
|  | Year Ended December 31, |
|  | 2015 |  |  | 2014 |
Weighted-average assumptions used to determine net periodic benefit cost for the Gray pension plan: |  |  |  |  |  |  |  |
Discount rate |  |  | 4.00 | % |  |  | 4.97 | %
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, |
|  | 2015 |  |  | 2014 |
Weighted-average assumptions used to determine benefit obligations: |  |  |  |  |  |  |  |
Discount rate |  |  | 4.31 | % |  |  | 4.00 | %
Estimated rate of increase in compensation levels |  |  | N/A |  |  |  | 5.63 | %
Schedule of Net Benefit Costs [Table Text Block] |
|  | Year Ended December 31, |
|  | 2015 |  |  | 2014 |  |  | 2013 |
Components of net periodic pension cost: |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 3,130 |  |  | $ | 5,162 |  |  | $ | 5,165 |
Interest cost |  |  | 4,159 |  |  |  | 4,106 |  |  |  | 3,553 |
Expected return on plan assets |  |  | (4,782 | ) |  |  | (4,200 | ) |  |  | (3,400 | )
Recognized net actuarial loss |  |  | 1,580 |  |  |  | 969 |  |  |  | 3,131 |
Net periodic pension cost |  | $ | 4,087 |  |  | $ | 6,037 |  |  | $ | 8,449 |
Schedule of Expected Benefit Payments [Table Text Block] |
Years |  |  | Amount |
| 2016 |  |  | $ | 2,312 |
| 2017 |  |  |  | 2,464 |
| 2018 |  |  |  | 2,646 |
| 2019 |  |  |  | 2,931 |
| 2020 |  |  |  | 3,372 |
2021 | - | 2025 |  |  | 20,521 |
Defined Benefit Plan, Fair Value of Plan Assets [Table Text Block] |
|  | As of December 31, 2015 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance general account |  | $ | - |  |  | $ | 17,918 |  |  | $ | - |  |  | $ | 17,918 |
Cash management accounts |  |  | 1,273 |  |  |  | - |  |  |  | - |  |  |  | 1,273 |
Equity accounts |  |  | 37,621 |  |  |  | - |  |  |  | - |  |  |  | 37,621 |
Fixed income accounts |  |  | 9,924 |  |  |  | - |  |  |  | - |  |  |  | 9,924 |
Real estate accounts |  |  | 2,510 |  |  |  | - |  |  |  | - |  |  |  | 2,510 |
Total |  | $ | 51,328 |  |  | $ | 17,918 |  |  | $ | - |  |  | $ | 69,246 |
|  | 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 |

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