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Note 12 - Pension and Other Postretirement Benefit Plans (Details) - For the Retirement Plan, the Change in Benefit Obligation and Assets - Retirement 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 $ 24,097 $ 19,740  
Interest cost 889 891 $ 827
Actuarial (gain) loss (1,208) 4,446  
Benefits paid (1,014) (980)  
Projected benefit obligation, balance 22,764 24,097 19,740
Change in plan assets:      
Market value of assets, balance 20,509 20,496  
Actual return on plan assets 429 993  
Benefits paid (1,014) (980)  
Market value of assets, balance 19,924 20,509 $ 20,496
Accrued pension liability included in other liabilities $ (2,840) $ (3,588)