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Foreign Sales
 3 Months Ended
Mar. 31, 2012
Foreign Revenues [Abstract]  
Foreign Revenues
H.  
Foreign Revenues
 
For the three months ended March 31, 2012 and 2011, foreign revenues were derived from the following countries:
 
   
Three Months Ended
March 31,
 
Foreign Revenues:
 
2012
  
2011
 
   
(in thousands)
 
Malaysia
 $1,079  $1,613 
China
  934   1,277 
Thailand
  359   294 
All other foreign countries
  950   1,663 
     Total foreign revenues
 $3,322  $4,847