Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments (Details Textual)

v2.4.0.6
Financial Instruments (Details Textual) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Instruments
Dec. 31, 2011
Jun. 30, 2012
Maximum [Member]
Jun. 30, 2012
Minimum [Member]
Debt Instrument [Line Items]        
Due date of company's long term available for sale securities     2 years 1 year
Period of unrealized loss position     12 months  
Financial Instrument (Textual) [Abstract]        
Number of corporate debt securities 18      
Fair value of debt $ 40,250      
Gross unrealized losses (17,000) (30,000)    
Transfer of securities, Level 1 0      
Transfer of securities, Level 2 0      
Transfer of securities, Level 3 $ 0