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Note 7 - Defined Benefit Plan (Tables)
 9 Months Ended
Sep. 30, 2016
Notes Tables  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
 
 
Pension Benefits
 
 
 
Nine Months Ended September 30,
 
 
 
2016
 
 
2015
 
Service cost
 
$
522
 
   $ 465  
Interest cost
 
 
567
 
     501  
Expected return on plan assets
 
 
(816
)
     (876
)
Amortization of prior service cost
 
 
(81
)
     (81
)
Recognized net actuarial loss
 
 
429
 
     312  
Net periodic benefit cost
 
$
621
 
   $ 321