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Note 8 - Employee Benefit Plans (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Note 8 - Employee Benefit Plans (Details) [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase |  |  |  |  | 2.00% |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets |  |  |  | 7.20% | 7.20% |
Long-term Investments (in Dollars) |  |  |  | $ 1,515,000 | $ 4,920,000 |
Defined Benefit Plan Assumed Long Term Rate Basis Spread |  |  |  | 1.00% |  |
Defined Benefit Plan, Fair Value of Plan Assets (in Dollars) |  |  |  | $ 73,321,000 | 74,551,000 | $ 69,051,000
Defined Benefit Plan, Contributions by Employer (in Dollars) |  | $ 4,900,000 |  | $ 5,460,000 | 6,715,000 |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match |  |  |  | 55.00% |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay |  |  |  | 5.00% |  |
Defined Benefit Plan Months of Services Required for Eligibility |  |  |  | 6 months |  |
Defined Contribution Plan, Employer Discretionary Contribution Amount (in Dollars) |  |  |  | $ 391,000 | 292,000 | 293,000
Years 1 Through 5 [Member] |  |  |  |  |  |
Note 8 - Employee Benefit Plans (Details) [Line Items] |  |  |  |  |  |
Cash Balance Pay Credit Percentage |  |  |  | 3.00% |  |
Years 6 Through 10 [Member] |  |  |  |  |  |
Note 8 - Employee Benefit Plans (Details) [Line Items] |  |  |  |  |  |
Cash Balance Pay Credit Percentage |  |  |  | 4.50% |  |
After 10 Years [Member] |  |  |  |  |  |
Note 8 - Employee Benefit Plans (Details) [Line Items] |  |  |  |  |  |
Cash Balance Pay Credit Percentage |  |  |  | 6.00% |  |
Assumed for 2016 Through 2018 [Member] |  |  |  |  |  |
Note 8 - Employee Benefit Plans (Details) [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase | [1] |  |  | 0.00% |  |
Assumed for after 2018 [Member] |  |  |  |  |  |
Note 8 - Employee Benefit Plans (Details) [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase | [1] |  |  | 2.00% |  |
Scenario, Forecast [Member] | Unfunded Supplemental Executive Retirement Plan [Member] |  |  |  |  |  |
Note 8 - Employee Benefit Plans (Details) [Line Items] |  |  |  |  |  |
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year (in Dollars) |  |  | $ 400,000 |  |  |
Common Stock [Member] |  |  |  |  |  |
Note 8 - Employee Benefit Plans (Details) [Line Items] |  |  |  |  |  |
Long-term Investments (in Dollars) |  |  |  | $ 4,300,000 | $ 1,400,000 |
Defined Benefit Plan, Actual Plan Asset Allocations |  |  |  | 6.00% | 2.00% |
Pension Compensation [Member] |  |  |  |  |  |
Note 8 - Employee Benefit Plans (Details) [Line Items] |  |  |  |  |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent |  |  |  | 6.00% |  |
Pension Compensation in Excess of Social Security Wages [Member] |  |  |  |  |  |
Note 8 - Employee Benefit Plans (Details) [Line Items] |  |  |  |  |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent |  |  |  | 5.70% |  |
Capital Accumulation 401(k) Plan [Member] |  |  |  |  |  |
Note 8 - Employee Benefit Plans (Details) [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Contributions by Employer (in Dollars) |  |  |  | $ 3,400,000 | $ 3,200,000 | $ 3,000,000
Defined Contribution Plan, Employer Matching Contribution, Percent of Match |  |  |  | 100.00% |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay |  |  |  | 6.00% |  |
Common Stock [Member] | Scenario, Forecast [Member] |  |  |  |  |  |
Note 8 - Employee Benefit Plans (Details) [Line Items] |  |  |  |  |  |
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year (in Dollars) |  |  | $ 5,300,000 |  |  |
Minimum [Member] |  |  |  |  |  |
Note 8 - Employee Benefit Plans (Details) [Line Items] |  |  |  |  |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent |  |  |  | 2.00% |  |
Minimum [Member] | Capital Accumulation 401(k) Plan [Member] |  |  |  |  |  |
Note 8 - Employee Benefit Plans (Details) [Line Items] |  |  |  |  |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent |  |  |  | 1.00% |  |
Maximum [Member] |  |  |  |  |  |
Note 8 - Employee Benefit Plans (Details) [Line Items] |  |  |  |  |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent |  |  |  | 50.00% |  |
Maximum [Member] | Capital Accumulation 401(k) Plan [Member] |  |  |  |  |  |
Note 8 - Employee Benefit Plans (Details) [Line Items] |  |  |  |  |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent |  |  |  | 50.00% |  |
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Note 8 - Employee Benefit Plans (Details) [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets (in Dollars) |  |  |  | $ 19,000,000 | 22,100,000 |
Fair Value, Inputs, Level 3 [Member] | Real Estate [Member] |  |  |  |  |  |
Note 8 - Employee Benefit Plans (Details) [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets (in Dollars) |  |  |  | 13,200,000 | 11,300,000 |
Fair Value, Inputs, Level 3 [Member] | Collective Investment Funds [Member] |  |  |  |  |  |
Note 8 - Employee Benefit Plans (Details) [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets (in Dollars) |  |  |  | $ 5,800,000 |  |
Deferred Compensation Plan Assets (in Dollars) |  |  |  |  | $ 10,800,000 |
[1] | 0% is assumed for years 2016 through 2018 and 2% is assumed thereafter.

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