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Note 10 - Pension and Other Postretirement Benefit Plans (Details Textual) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 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 | $ 36,000 |
Retirement Plan [Member] | Savings Bank [Member] |  |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | 0 |
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 | $ 15,000 |

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- Definition Amount of contributions expected to be received by defined benefit plan from employer in next fiscal year following latest fiscal year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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