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Note 12 - Pension and Other Postretirement Benefit Plans (Details) - For the Postretirement Plans, the Change in Benefit Obligation and Assets - Postretirement Plans [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Change in benefit obligation:      
Projected benefit obligation, balance $ 8,073 $ 5,586  
Service cost 382 358 $ 449
Interest cost 300 253 219
Actuarial loss (gain) (715) 1,925  
Benefits paid (63) (49)  
Projected benefit obligation, balance 7,977 8,073 $ 5,586
Change in plan assets:      
Employer contributions 63 49  
Benefits paid (63) (49)  
Accrued pension cost included in other liabilities $ (7,977) $ (8,073)