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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

X

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Fair value, as of the acquisition date, of potential payments under the contingent consideration arrangement including cash and shares.

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