Investments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			3 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011 Langfang Haobo Diamond Co., Ltd. [Member]	Sep. 30, 2010 Langfang Haobo Diamond Co., Ltd. [Member]	Jun. 30, 2011 Langfang Haobo Diamond Co., Ltd. [Member]	Jul. 31, 2009 Langfang Haobo Diamond Co., Ltd. [Member]	Sep. 30, 2011 Fuxin Electronic Technology Company [Member]	Sep. 30, 2010 Fuxin Electronic Technology Company [Member]	Jun. 30, 2011 Fuxin Electronic Technology Company [Member]	Jul. 31, 2008 Fuxin Electronic Technology Company [Member]	Mar. 31, 2007 Fuxin Electronic Technology Company [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage						40.00%	20.20%			10.20%	10.00%
Total carrying value of investment	$ 15,777	$ 15,431	$ 5,200		$ 5,300		$ 10,600		$ 10,100	$ 4,900	$ 3,600
Pro-rata share of earnings (losses)	$ (326)	$ (170)	$ 100	$ 100			$ 400	$ 200

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

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+ Details