Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Subsequent events (Details Textual)

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Subsequent events (Details Textual) (Subsequent Event [Member])
In Millions, unless otherwise specified
 1 Months Ended 12 Months Ended
Feb. 28, 2013
Dec. 31, 2012
Subsequent Event [Member]
    
Stock Options Exercise Granted 4.0 2.5