Short-Term and Long-Term Obligations (Details)	3 Months Ended				3 Months Ended	1 Months Ended			3 Months Ended		9 Months Ended						1 Months Ended		1 Months Ended						1 Months Ended								3 Months Ended
	Sep. 30, 2012	Jun. 30, 2010 Building	Jun. 30, 2010	Sep. 30, 2012 LIBOR [Member]	Sep. 30, 2012 Bank of America Credit Agreement [Member] Consecutive_Quarters	Jul. 29, 2012 Bank of America [Member] USD ($)	Dec. 31, 2010 Bank of America [Member] USD ($)	Jun. 30, 2010 Bank of America [Member] USD ($)	Sep. 30, 2012 Bank of America [Member] USD ($)	Sep. 30, 2011 Bank of America [Member] USD ($)	Jun. 30, 2012 Bank of America [Member] USD ($)	Oct. 31, 2011 Bank of America [Member] USD ($)	Jun. 15, 2010 Bank of America [Member] USD ($)	Sep. 30, 2012 Bank of America [Member] Term Loan [Member] USD ($)	Jun. 30, 2012 Bank of America [Member] Term Loan [Member] USD ($)	Oct. 31, 2011 Bank of America [Member] Term Loan [Member] USD ($)	Oct. 31, 2011 Wells Fargo Bank [Member] Term Loan [Member] USD ($)	Dec. 31, 2010 Wells Fargo Bank [Member] Term Loan [Member] USD ($)	Jul. 29, 2012 China Trust Bank [Member] USD ($)	Jul. 29, 2012 China Trust Bank [Member] TWD	Jun. 30, 2012 China Trust Bank [Member]	Oct. 31, 2011 China Trust Bank [Member]	Oct. 30, 2011 China Trust Bank [Member] USD ($)	Oct. 30, 2011 China Trust Bank [Member] TWD	Oct. 31, 2011 Term Loan [Member] Bank of America [Member]	Jul. 29, 2012 Term Loan [Member] China Trust Bank [Member] USD ($)	Jul. 29, 2012 Term Loan [Member] China Trust Bank [Member] TWD	Sep. 30, 2012 Term Loan [Member] China Trust Bank [Member] USD ($)	Jul. 31, 2012 Term Loan [Member] China Trust Bank [Member] USD ($)	Jul. 31, 2012 Term Loan [Member] China Trust Bank [Member] TWD	Sep. 30, 2012 Maximum [Member] Bank of America [Member]	Jun. 30, 2012 Maximum [Member] Bank of America [Member]	Sep. 30, 2012 Minimum [Member] Bank of America Credit Agreement [Member] USD ($)	Sep. 30, 2012 Minimum [Member] Bank of America [Member]	Jun. 30, 2012 Minimum [Member] Bank of America [Member]	Jun. 30, 2012 Foreign Currency Translation [Member] Bank of America [Member] USD ($)	Sep. 30, 2012 Foreign Currency Translation [Member] China Trust Bank [Member] USD ($)
Short-term and long-term obligations
Line of credit facility, maximum borrowing capacity												$ 40,000,000	$ 25,000,000										$ 9,898,000	300,000,000
Line of credit facility or term loan, basis spread on variable rate												1.25%	1.50%			1.50%						0.50%							0.30%	0.30%
Line of credit facility, additional borrowings								18,553,000	5,600,000	3,156,000
Number of buildings purchased in San Jose		3	3
Lines of credit facility, repayments						(4,863,000)	(13,854,000)		(4,846,000)		(9,898,000)								(10,027,000)	(300,000,000)
Term Loan Length Of Time																									5 years	1 year	1 year
Term loan, face amount																14,000,000		13,875,000											14,912,000	450,000,000
Line of credit facility, outstanding							4,699,000		11,299,000		10,562,000																									4,863,000	15,324,000
Term loan, repayments																	13,413,000
Line of credit facility or term loan, description of variable rate basis	LIBOR
Interest rate, period end				0.23%																								1.16%			1.73%	1.81%		1.16%	1.29%
Term loan, outstanding														11,433,000	12,133,000
Line of credit facility, unused amount									28,701,000
Line of credit facility, interest rate at period end																					1.41%
Term loan, additional borrowings																										5,014,000	150,000,000
Not to incur on a consolidated basis, a net loss before taxes and extraordinary items in any two consecutive quarterly accounting periods					2
The Company's funded debt to EBITDA ratio (ratio of all outstanding liabilities for borrowed money and other interest-bearing liabilities, including current and long-term debt, less the non-current portion of subordinated liabilities to EBITDA), shall not be greater than																																	2
The Company's unencumbered liquid assets, as defined in the agreement, held in the United States shall have an aggregate market value, of not less than																																	30,000,000
Total assets collateralizing line of credit									520,529,000		571,060,000
Total assets collateralizing term loan														$ 17,986,000	$ 18,043,000													$ 28,030,000