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7. Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Assets:    
Trade receivables, net $ 2,162 $ 3,383
Certificate of deposit 250 500
Goodwill 265 265
Intangible assets 0 6
Carrying Value [Member]
   
Assets:    
Trade receivables, net 2,196 3,438
Certificate of deposit 500 500
Estimated Fair Value [Member]
   
Assets:    
Trade receivables, net 2,162 3,383
Certificate of deposit $ 500 $ 500