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Other Comprehensive Income (Loss) (Details Textual) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Other Comprehensive Income (Loss) (Additional Textual) [Abstract]      
Other comprehensive income       
Other Comprehensive Income (Loss) (Textual) [Abstract]      
Other comprehensive income   0  
Accumulated other comprehensive income     0
Maximum [Member]
     
Other Comprehensive Income (Loss) (Additional Textual) [Abstract]      
Other comprehensive income $ 500