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Note 7 - Defined Benefit Plan (Tables)
 6 Months Ended
Jun. 30, 2016
Notes Tables  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
 
 
Pension Benefits
Six Months Ended June 30,
 
 
 
2016
 
 
2015
 
Service cost
 
$
348
 
   $ 310  
Interest cost
 
 
378
 
     334  
Expected return on plan assets
 
 
(544
)
     (584
)
Amortization of prior service cost
 
 
(54
)
     (54
)
Recognized net actuarial loss
 
 
286
 
     208  
Net periodic benefit cost
 
$
414
 
   $ 214