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Note 12 - Pension and Other Postretirement Benefit Plans (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets | 0.00% | 0.00% | 0.00%
Trust for Benefit of Employees [Member] |  |  |
Full Time Employment, Years of Service | 1 year |  |
Employer Contributions to the 401(k) and Profit Sharing Plans Funded By the Employee Benefit Trust | $ 3,200,000 | $ 2,800,000 | $ 2,800,000
Retirement Plan [Member] |  |  |
Defined Benefit Plan, Benefit Obligation | $ 23,605,000 | $ 22,769,000 | $ 22,764,000
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets | 7.00% | 7.25% | 7.50%
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months | $ 1,421,000 |  |
Retirement Plan [Member] | Savings Bank [Member] |  |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer | 0 | $ 0 | $ 0
Defined Benefit Plan, Benefit Obligation | $ 23,600,000 | 22,800,000 |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets | 7.00% |  |
Retirement Plan [Member] | Savings Bank [Member] | Equity Securities [Member] |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 60.00% |  |
Retirement Plan [Member] | Savings Bank [Member] | Fixed Income Securities [Member] |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 40.00% |  |
Retirement Plan [Member] | Savings Bank [Member] | U.S. Small-cap Blend [Member] |  |  |
Pension Plan Assets, Equity Securities Held in Mutual Funds, Minimum Market Capitalization | $ 100,000,000 |  |
Retirement Plan [Member] | Minimum [Member] |  |  |
Defined Benefit Plan, Benefit Service Period | 3 years |  |
Retirement Plan [Member] | Minimum [Member] | Savings Bank [Member] | Equity Securities [Member] |  |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets | 8.00% |  |
Retirement Plan [Member] | Minimum [Member] | Savings Bank [Member] | Fixed Income Securities [Member] |  |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets | 3.00% |  |
Retirement Plan [Member] | Minimum [Member] | Savings Bank [Member] | U.S. Large-Cap Growth [Member] |  |  |
Number of Stocks Held in Portfolio | 55 |  |
Retirement Plan [Member] | Minimum [Member] | Savings Bank [Member] | U.S. Small-cap Blend [Member] |  |  |
Number of Stocks Held in Portfolio | 40 |  |
Retirement Plan [Member] | Minimum [Member] | Savings Bank [Member] | International Blend [Member] |  |  |
Number of Stocks Held in Portfolio | 80 |  |
Retirement Plan [Member] | Maximum [Member] |  |  |
Defined Benefit Plan, Benefit Service Period | 10 years |  |
Retirement Plan [Member] | Maximum [Member] | Savings Bank [Member] | Equity Securities [Member] |  |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets | 10.00% |  |
Retirement Plan [Member] | Maximum [Member] | Savings Bank [Member] | Fixed Income Securities [Member] |  |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets | 5.00% |  |
Retirement Plan [Member] | Maximum [Member] | Savings Bank [Member] | U.S. Large-Cap Growth [Member] |  |  |
Number of Stocks Held in Portfolio | 70 |  |
Retirement Plan [Member] | Maximum [Member] | Savings Bank [Member] | U.S. Small-cap Blend [Member] |  |  |
Number of Stocks Held in Portfolio | 100 |  |
Retirement Plan [Member] | Maximum [Member] | Savings Bank [Member] | International Blend [Member] |  |  |
Number of Stocks Held in Portfolio | 90 |  |
Other Postretirement Benefits Plan [Member] |  |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer | $ 83,000 | 65,000 |
Defined Benefit Plan, Benefit Obligation | $ 9,104,000 | 7,978,000 | 7,977,000
Number of Unfunded Postretirement Benefit Plans | 2 |  |
Full Time Employment, Years of Service | 5 years |  |
Cost Sharing Arrangement, Medical Benefits Percentage | 50.00% |  |
Medical Premiums, Required Percentage to Be Paid By Spouses of Future Retirees | 100.00% |  |
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months | $ 236,000 |  |
The 401(k) Plan [Member] |  |  |
Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage | 20.00% |  |
Defined Contribution Plan, Employer's Matching Contribution, Vesting Percentage, Upon Change of Control | 100.00% |  |
Defined Contribution Plan, Cost | $ 3,400,000 | 3,300,000 | 3,000,000
The 401(k) Plan [Member] | Savings Bank [Member] |  |  |
Defined Contribution Plan, Annual Employer Matching of Employees Contribution, Percent | 50.00% |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | 3.00% |  |
Defined Contribution Retirement Plan ("DCRP") [Member] | Savings Bank [Member] |  |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | 4.00% |  |
Non-qualified Deferred Compensation Plan [Member] |  |  |
Defined Contribution Plan, Annual Employer Matching of Employees Contribution, Percent | 50.00% |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | 5.00% |  |
Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage | 20.00% |  |
Defined Contribution Plan, Employer's Matching Contribution, Vesting Percentage, Upon Change of Control | 100.00% |  |
Defined Contribution Plan, Cost | $ 400,000 | 400,000 | 400,000
Defined Contribution Plan, Service Period Requirement | 1 year |  |
Defined Contribution Plan, Vesting Period | 5 years |  |
Deferred Compensation Plan, Amounts Held in Rabbi Trust | $ 11,500,000 | 10,400,000 |
Directors' Plan [Member] |  |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer | 144,000 | 144,000 |
Defined Benefit Plan, Benefit Obligation | $ 2,425,000 | 2,462,000 | $ 2,530,000
Full Time Employment, Years of Service | 5 years |  |
Deferred Compensation Plan, Amounts Held in Rabbi Trust | $ 4,400,000 | $ 4,200,000 |
Defined Benefit Plan, Annual Retirement Benefit | $ 48,000 |  |
Defined Benefit Contributions, Months of Benefit Used in Lump Sum Payment in the Event of Termination | 10 years |  |
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months | $ 248,000 |  |

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- Definition The period of time the benefits used in a lump sum payment in the event of a termination with the defined benefits contribution. + References No definition available. + Details
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- Definition Percentage of employees' annual contributions for which the employer contributes a matching contribution to a defined contribution plan, up to a specified limit. + References No definition available. + Details
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- Definition Percentage of employer's matching contributions to a defined contribution plan that vests due to a change of control (as defined in the applicable plan). + References No definition available. + Details
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- Definition Service period required to participate in the Defined Contribution Plan. + References No definition available. + Details
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- Definition Employer contributions to the 401(k) and profit sharing plans funded by the Employee Benefit Trust. + References No definition available. + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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