Note 7 - Property, Plant, and Equipment (Tables)
 12 Months Ended
Dec. 31, 2015
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment [Table Text Block]
   

2015

    

2014

  

Land and land improvements

   $ 5,741     $ 5,741  

Buildings and building equipment

     26,478       26,524  

Machinery and equipment

     157,289       152,792  

Construction in progress

     3,586       1,186  

Accumulated depreciation

     (68,764

)

     (58,872

)

Total

   $ 124,330     $ 127,371