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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)