Annual report pursuant to Section 13 and 15(d)

Leases (Details Textual)

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Leases (Details Textual) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Leases (Textual) [Abstract]      
Lease rent expenses $ 1.3 $ 0.7 $ 0.8