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Note 12 - Pension and Other Postretirement Benefit Plans (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 1995
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets |  |  |  |
Retirement Plan [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Defined Benefit Plan, Benefit Obligation | $ 22,764,000 | $ 24,097,000 | $ 19,740,000 |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets | 7.50% | 7.50% | 7.50% |
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months | $ 1,172,000 |  |  |
Postretirement Plans [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Defined Benefit Plan, Contributions by Employer | 63,000 | $ 49,000 |  |
Defined Benefit Plan, Benefit Obligation | $ 7,977,000 | $ 8,073,000 | $ 5,586,000 |
Number of Unfunded Postretirement Benefit Plans | 2 |  |  |
Full Time Employment Years of Service | 5 years |  |  |
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months | $ 189,000 |  |  |
Postretirement Plan 1 [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Cost Sharing Arrangement, Medical Benefits, Percentage |  | 50.00% |  |
Medical Premiums, Required Percentage to be Paid by Spouses of Future Retirees |  | 100.00% |  |
401(k) [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Defined Contribution Plan Service Period Requirement | 1 year |  |  |
Directors' Plan [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Defined Benefit Plan, Contributions by Employer | $ 144,000 | $ 120,000 |  |
Defined Benefit Plan, Benefit Obligation | $ 2,530,000 | 2,663,000 | 2,666,000 |
Full Time Employment Years of Service | 5 years |  |  |
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months | $ 288,000 |  |  |
In Event of Termination [Member] | Directors' Plan [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Full Time Employment Years of Service | 2 years |  |  |
Defined Benefit Contributions, Months of Benefit Used in Lump Sum Payment | 120 months |  |  |
Trust for Benefit of Employees [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Full Time Employment Years of Service | 1 year |  |  |
Amount Borrowed From the Company by the Employee Benefit Trust |  |  |  | $ 7,900,000
Stock Issued During Period, Value, Employee Benefit Plan |  |  |  | $ 7,000
Stock Issued During Period, Shares, Employee Benefit Plan (in Shares) |  |  |  | 2,328,750
Employer Contributions to the 401(k) and Profit Sharing Plans Funded By the Employee Benefit Trust | $ 2,800,000 | 2,700,000 | 2,300,000 |
401(k) [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage | 20.00% |  |  |
Defined Contribution Plan, Vesting Period | 5 years |  |  |
Defined Contribution Plan, Employers Matching Contribution, Vesting Percentage Upon Change of Control | 100.00% |  |  |
Defined Contribution Plan, Cost Recognized | $ 3,000,000 | 3,100,000 | 2,900,000 |
Non-Qualified Deferred Compensation Plan [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Defined Contribution Plan Annual Employer Matching of Employee's 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, Vesting Period | 5 years |  |  |
Defined Contribution Plan, Employers Matching Contribution, Vesting Percentage Upon Change of Control | 100.00% |  |  |
Defined Contribution Plan, Cost Recognized | $ 400,000 | 400,000 | 400,000 |
Defined Benefit Plan, Assets for Plan Benefits | 10,600,000 | 10,000,000 |  |
Savings Bank [Member] | Retirement Plan [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Defined Benefit Plan, Contributions by Employer | 0 | 0 | $ 800,000 |
Defined Benefit Plan, Benefit Obligation | 22,800,000 | 24,100,000 |  |
Savings Bank [Member] | Directors' Plan [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Defined Benefit Plan, Benefit Obligation | 2,500,000 | 2,700,000 |  |
Defined Benefit Plan, Assets for Plan Benefits | 4,200,000 | $ 3,900,000 |  |
Annual Retirement Benefit Paid to Terminating Eligible Directors | 48,000 |  |  |
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year | 288,000 |  |  |
Savings Bank [Member] | U.S. Small-Cap Blend [Member] | Retirement Plan [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Pension Plan Assets, Equity Securities Held in Mutual Funds, Minimum Market Capitalization | $ 100,000,000 |  |  |
Savings Bank [Member] | Equity Securities [Member] | Retirement Plan [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations | 60.00% |  |  |
Savings Bank [Member] | Fixed Income Securities [Member] | Retirement Plan [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations | 40.00% |  |  |
Savings Bank [Member] | 401(k) [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Defined Contribution Plan Annual Employer Matching of Employee's Contribution Percent | 50.00% |  |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | 3.00% |  |  |
Savings Bank [Member] | Defined Contribution Retirement Plan ("DCRP") [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | 4.00% |  |  |
Minimum [Member] | Retirement Plan [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Defined Benefit Plan, Benefit Service Period | 3 years |  |  |
Minimum [Member] | Savings Bank [Member] | Retirement Plan [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets | 8.00% |  |  |
Minimum [Member] | Savings Bank [Member] | U.S. Large-Cap Growth [Member] | Retirement Plan [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Number of Stocks Held in Portfolio | 55 |  |  |
Minimum [Member] | Savings Bank [Member] | U.S. Small-Cap Blend [Member] | Retirement Plan [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Number of Stocks Held in Portfolio | 40 |  |  |
Minimum [Member] | Savings Bank [Member] | International blend [Member] | Retirement Plan [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Number of Stocks Held in Portfolio | 80 |  |  |
Minimum [Member] | Savings Bank [Member] | Equity Securities [Member] | Retirement Plan [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets | 8.00% |  |  |
Minimum [Member] | Savings Bank [Member] | Fixed Income Securities [Member] | Retirement Plan [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets | 3.00% |  |  |
Maximum [Member] | Retirement Plan [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Defined Benefit Plan, Benefit Service Period | 10 years |  |  |
Maximum [Member] | Savings Bank [Member] | U.S. Large-Cap Growth [Member] | Retirement Plan [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Number of Stocks Held in Portfolio | 70 |  |  |
Maximum [Member] | Savings Bank [Member] | U.S. Small-Cap Blend [Member] | Retirement Plan [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Number of Stocks Held in Portfolio | 100 |  |  |
Maximum [Member] | Savings Bank [Member] | International blend [Member] | Retirement Plan [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Number of Stocks Held in Portfolio | 90 |  |  |
Maximum [Member] | Savings Bank [Member] | Equity Securities [Member] | Retirement Plan [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets | 10.00% |  |  |
Maximum [Member] | Savings Bank [Member] | Fixed Income Securities [Member] | Retirement Plan [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets | 5.00% |  |  |
Less Than [Member] | In Event of Termination [Member] | Directors' Plan [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Full Time Employment Years of Service | 2 years |  |  |

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