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Note 14 - Supplemental Retirement Benefits (Details Textual) - Supplemental Employee Retirement Plan [Member] - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total $ 2,000 $ 3,000 $ 4,000
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 4.10%    
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months $ 25,000