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Note 10 - Pension and Other Postretirement Benefit Plans (Details Textual) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Directors' Plan [Member] |  |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year |  | $ 300,000
Defined Benefit Plan, Plan Assets, Contributions by Employer | $ 72,000 |
Other Postretirement Benefit Plans [Member] |  |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year |  | $ 300,000
Other Postretirement Benefits Plan [Member] |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer | 37,000 |
Retirement Plan [Member] | Savings Bank [Member] |  |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | $ 0 |

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