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Note 3 - Inventories (Tables)
9 Months Ended
Sep. 30, 2015
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
   

September 30,

   

December 31,

 
   

2015

   

2014

 
   

(Dollars in thousands)

 

Raw materials and purchased parts for assembly

  $ 5,470     $ 4,840  

Self-manufactured assembly parts and finished products

    11,125       12,090  

Total

  $ 16,595     $ 16,930