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Inventories
6 Months Ended
Jun. 30, 2010
Inventories [Abstract]  
Inventories
10.  Inventories

Inventories are carried at the lower of cost or market, determined on the first-in, first-out (FIFO) method.

Inventories consisted of the following:
 
   
June 30,
2011
   
December 31,
2010
 
           
Raw materials
 
$
2,294,000
   
$
2,311,000
 
Work in process
   
652,000
     
410,000
 
Finished goods
   
945,000
     
657,000
 
   
$
3,891,000
   
$
3,378,000