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Note 12 - Pension and Other Postretirement Benefit Plans (Details) - For the Directors’ Plan, the Change in Benefit Obligation and Assets - Directors' Plan [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Change in benefit obligation:      
Projected benefit obligation, balance $ 2,663 $ 2,666  
Service cost 45 54 $ 82
Interest cost 95 116 98
Actuarial gain (129) (53)  
Benefits paid (144) (120)  
Projected benefit obligation, balance 2,530 2,663 $ 2,666
Change in plan assets:      
Employer contributions 144 120  
Benefits paid (144) (120)  
Accrued pension cost included in other liabilities $ (2,530) $ (2,663)