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Other events (Details Textual) (USD $)
In Thousands, except Per Share data, unless otherwise specified
1 Months Ended 6 Months Ended
Dec. 31, 2012
Apr. 30, 2013
Apr. 30, 2012
Other events (Textual) [Abstract]      
Dividend payment $ 0.65    
Dividend aggregate amount to shareholders $ 9,600 $ 9,646 $ 8,124
Dividend paid date Nov. 28, 2012