Investments (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended					3 Months Ended		6 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 Langfang Haobo Diamond Co., Ltd. [Member]	Jun. 30, 2011 Langfang Haobo Diamond Co., Ltd. [Member]	Jul. 31, 2009 Langfang Haobo Diamond Co., Ltd. [Member]	Dec. 31, 2011 Fuxin Electronic Technology Company [Member]	Dec. 31, 2010 Fuxin Electronic Technology Company [Member]	Dec. 31, 2011 Fuxin Electronic Technology Company [Member]	Dec. 31, 2010 Fuxin Electronic Technology Company [Member]	Jun. 30, 2011 Fuxin Electronic Technology Company [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage					40.00%	20.20%		20.20%
Total carrying value of investment	$ 15,938	$ 15,436	$ 5,100	$ 5,300		$ 10,800		$ 10,800		$ 10,100
Pro-rata share of earnings (losses)	$ 484	$ 174				$ 300	$ 100	$ 700	$ 400