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Subsequent Event (Details) (Subsequent events, USD $) | 1 Months Ended |
--- | --- | ---
Aug. 31, 2013 | Jul. 01, 2013 ST Acquisitions
Subsequent events |  |
Purchase price of acquired assets |  | $ 1,821,000
Cash payment |  | 1,721,000
Holdback amount expected to be settled |  | $ 100,000
Quarterly cash dividend (in dollars per share) | $ 0.14 |

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