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Other Investments (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Great Wall Semiconductor Corporation (GWS) [Member]	Dec. 31, 2012 Great Wall Semiconductor Corporation (GWS) [Member]	Mar. 31, 2013 Great Wall Semiconductor Corporation (GWS) [Member] Convertible preferred stock [Member]	Dec. 31, 2012 Great Wall Semiconductor Corporation (GWS) [Member] Convertible preferred stock [Member]
Other Investments (Additional Textual) [Abstract]
Ownership interest in investment	27.00%	27.00%
Purchase of components under agreement	$ 396,000	$ 378,000
Allocation of equity method income (loss)	0	0
Other Investments (Textual) [Abstract]
Investment in non-voting convertible preferred stock			$ 0	$ 0	$ 5,000,000	$ 5,000,000

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- Definition

The amount of income (loss) from operations derived by the reporting entity during the period from the Variable Interest Entity (VIE).

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The amount of purchases between the reporting entity and the Variable Interest Entity (VIE).

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The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

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