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Note 12 - Pension and Other Postretirement Benefit Plans - For the Retirement Plan, the Change in Benefit Obligation and Assets (Details) - Retirement Plan [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Change in benefit obligation:      
Projected benefit obligation at beginning of year $ 22,769 $ 22,764  
Interest cost 864 902 $ 889
Actuarial loss 962 130  
Benefits paid (990) (1,027)  
Projected benefit obligation at end of year 23,605 22,769 22,764
Change in plan assets:      
Market value of assets at beginning of year 20,146 19,924  
Actual return on plan assets 3,546 1,249  
Benefits paid (990) (1,027)  
Market value of plan assets at end of year 22,702 20,146 $ 19,924
Accrued pension liability included in other liabilities $ (903) $ (2,623)