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Note 13 - Supplemental Retirement Benefits (Details Textual) - Supplemental Employee Retirement Plan [Member] - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) $ 3,000 $ 4,000 $ 4,000
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 3.50%    
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months $ 25,000    
Defined Benefit Plan, Expected Future Benefit Payment, Year Two $ 25,000