Receivables
 3 Months Ended 12 Months Ended
Mar. 31, 2012
Dec. 31, 2011
Receivables [Abstract]    
Receivables
Note 2:  Accounts Receivable
 
The majority of the Company's commercial accounts receivable are due from Original Equipment Manufacturers ("OEM's"). Credit is extended based on an evaluation of a customer's financial condition and, generally, collateral is not required.

Accounts receivable consisted of the following (in thousands):

   
March 31,
2012
 (unaudited)
    
December 31, 2011
  
Accounts receivable
  
$
4,912
    
$
5,844
  
Less allowance for doubtful accounts
    
(268
)
    
(268
)
Accounts receivable, net 
  
$
4,644
    
$
5,576
  
 

Note 3- RECEIVABLES

Receivables consisted of the following (in thousands):

    December 31,  
    2011     2010  
Trade receivables $ 5,844   $ 5,524  
Less allowance for doubtful accounts   (268 )   (374 )
Net receivables $ 5,576   $ 5,150