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Note 13 - Employee Benefit Plans - Schedule of Changes in Aggregate Actuarial Benefit Obligation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Beginning balance $ 9,181 $ 8,390  
Plan change 258 69  
Service cost 231 184 $ 180
Interest cost 372 382 334
Actuarial (gain) loss (48) 367  
Benefits paid (359) (211)  
Ending balance $ 9,635 $ 9,181 $ 8,390