Annual report pursuant to Section 13 and 15(d)

Fair Value (Details Textual)

v2.4.0.6
Fair Value (Details Textual) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Fair Value (Textual) [Abstract]      
Unamortized trade names $ 500,000    
Term of amortization 11 years    
Goodwill impairment charge 0 2,400,000 0
Determined fair value   400,000  
Impairment charge of indefinite-lived intangible 0   0
Trade Names [Member]
     
Fair Value (Textual) [Abstract]      
Impairment charge of indefinite-lived intangible 0 100,000 0
Max-Viz, Inc [Member]
     
Fair Value (Textual) [Abstract]      
Revenue growth target period 3 years    
Ballard [Member]
     
Fair Value (Textual) [Abstract]      
Revenue growth target period 5 years    
Maximum [Member] | Max-Viz, Inc [Member]
     
Fair Value (Textual) [Abstract]      
Contingent consideration on fair value liabilities 8,000,000    
Maximum [Member] | Ballard [Member]
     
Fair Value (Textual) [Abstract]      
Contingent consideration on fair value liabilities 5,500,000    
Test Systems [Member]
     
Fair Value (Textual) [Abstract]      
Unamortized trade names 400,000    
Term of amortization 10 years    
Total amortized intangible assets $ 3,900,000