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2. Inventories (Tables)
 6 Months Ended
Jun. 30, 2016
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block] The components of inventories are:

   
June 30,
    
December 31,
   
2016
    
2015
   
(In thousands)
           
Raw materials and purchased component parts
   $ 5,285     $ 6,627
Work-in-process
     56       1
Finished goods
     3,678       4,668
    $ 9,019     $ 11,296