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Note 4 - Product Inventories
6 Months Ended
Jun. 30, 2013
Inventory Disclosure [Abstract]  
Inventory Disclosure [Text Block]

Note 4.  Product Inventories 


Product inventories consist of the following:


In thousands of dollars


   

June 30, 2013

   

December 31, 2012

 

Raw materials

  $ 1,784     $ 2,337  

Work in process

    1,783       3,666  

Finished goods

    1,199       1,413  

Total product inventories

  $ 4,766     $ 7,416  

As of June 30, 2013 and December 31, 2012, inventory relates to the production of battery systems targeted at the electric grid, transportation, and industrial markets.


Inventory valuation allowances, totaled $442,000 and $331,000 at June 30, 2013 and December 31, 2012, respectively.