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Note 10 - Pension and Other Postretirement Benefit Plans (Details Textual) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 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 | $ 108,000 |
Other Postretirement Benefit Plans [Member] |  |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year |  | $ 300,000
Defined Benefit Plan, Plan Assets, Contributions by Employer | 54,000 |
Retirement Plan [Member] | Savings Bank [Member] |  |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | $ (0) |

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