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Note 12 - Pension and Other Postretirement Benefit Plans - For the Retirement Plan, the Change in Benefit Obligation and Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Change in benefit obligation:    
Projected benefit obligation at beginning of year $ 22,764 $ 24,097
Interest cost 902 889
Actuarial (gain) loss 130 (1,208)
Benefits paid (1,027) (1,014)
Projected benefit obligation at end of year 22,769 22,764
Change in plan assets:    
Market value of assets at beginning of year 19,924 20,509
Actual return on plan assets 1,249 429
Benefits paid (1,027) (1,014)
Market value of plan assets at end of year 20,146 19,924
Accrued pension liability included in other liabilities $ (2,623) $ (2,840)