FINANCING ARRANGEMENTS (DETAILS)			12 Months Ended												12 Months Ended					12 Months Ended				0 Months Ended			12 Months Ended				0 Months Ended		12 Months Ended														12 Months Ended						12 Months Ended								12 Months Ended
	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2014 Taiwan mortgage loan [Member] USD ($) Rate	Dec. 31, 2014 Taiwan mortgage loan [Member] TWD	Dec. 31, 2013 Taiwan mortgage loan [Member] USD ($) Rate	Dec. 31, 2013 Taiwan mortgage loan [Member] TWD Rate	May 31, 2006 Taiwan mortgage loan [Member] USD ($)	May 31, 2006 Taiwan mortgage loan [Member] TWD	Dec. 31, 2014 Mortgages [Member] USD ($)	Dec. 31, 2013 Mortgages [Member] USD ($)	Dec. 31, 2014 Construction Loans [Member] USD ($)	Dec. 31, 2013 Construction Loans [Member] USD ($)	Dec. 31, 2014 Term Loans [Member] USD ($)	Dec. 31, 2013 Term Loans [Member] USD ($)	Dec. 31, 2014 Jiaxing construction loan [Member] Rate	Dec. 31, 2013 Jiaxing construction loan [Member] USD ($)	Dec. 31, 2013 Jiaxing construction loan [Member] CNY	Aug. 31, 2011 Jiaxing construction loan [Member] USD ($)	Aug. 31, 2011 Jiaxing construction loan [Member] CNY	Dec. 31, 2014 Forkardt term loan [Member] USD ($) Rate	Dec. 31, 2013 Forkardt term loan [Member] USD ($) Rate	Oct. 31, 2013 Forkardt term loan [Member] Rate	May 31, 2013 Forkardt term loan [Member] USD ($) Rate	Nov. 30, 2013 USD denominated Forkardt term loan [Member] [Member] USD ($)	Nov. 30, 2013 CHF denominated Forkardt term loan [Member] USD ($)	Nov. 30, 2013 CHF denominated Forkardt term loan [Member] CHF	Dec. 31, 2014 CHF denominated Forkardt term loan [Member] USD ($) Rate	Dec. 31, 2014 CHF denominated Forkardt term loan [Member] CHF	Dec. 31, 2013 CHF denominated Forkardt term loan [Member] USD ($) Rate	Dec. 31, 2013 CHF denominated Forkardt term loan [Member] CHF Rate	Nov. 30, 2013 EUR denominated Forkardt term loan [Member] USD ($)	Nov. 30, 2013 EUR denominated Forkardt term loan [Member] EUR (€)	Dec. 31, 2014 EUR denominated Forkardt term loan [Member] USD ($) Rate	Dec. 31, 2014 EUR denominated Forkardt term loan [Member] EUR (€) Rate	Dec. 31, 2013 EUR denominated Forkardt term loan [Member] USD ($) Rate	Dec. 31, 2013 EUR denominated Forkardt term loan [Member] EUR (€) Rate	Dec. 31, 2014 Kellenberger mortgage loan [Member] USD ($)	Dec. 31, 2014 Kellenberger mortgage loan [Member] CHF	Jul. 31, 2013 Kellenberger mortgage loan [Member] USD ($) Rate	Jul. 31, 2013 Kellenberger mortgage loan [Member] CHF	Dec. 31, 2014 Kellenberger previous mortgage loan [Member] USD ($)	Dec. 31, 2014 Kellenberger previous mortgage loan [Member] CHF	Jul. 31, 2013 Kellenberger previous mortgage loan [Member] Rate	Dec. 31, 2014 Kellenberger HH-GmbH revolving credit facility [Member] Rate	Dec. 31, 2012 Jiaxing Line of Credit [Member] USD ($)	Dec. 31, 2012 Jiaxing Line of Credit [Member] CNY	Dec. 31, 2014 Domestic Line of Credit [Member] USD ($) Rate	Dec. 31, 2013 Domestic Line of Credit [Member] USD ($) Rate	Dec. 31, 2012 Domestic Line of Credit [Member] Rate	Dec. 31, 2011 Domestic Line of Credit [Member] USD ($) Rate	Dec. 31, 2010 Domestic Line of Credit [Member] Rate	Dec. 31, 2009 Domestic Line of Credit [Member] USD ($)	Dec. 31, 2014 Jiaxing Line of Credit [Member] USD ($)	Dec. 31, 2013 Jiaxing Line of Credit [Member] USD ($)	Jan. 07, 2014 Jiaxing Line of Credit [Member] USD ($)	Jan. 07, 2014 Jiaxing Line of Credit [Member] CNY	Dec. 31, 2012 Jiaxing Line of Credit [Member] USD ($)	Dec. 31, 2012 Jiaxing Line of Credit [Member] CNY	Dec. 31, 2014 Unsecured domestic credit facility [Member] USD ($)	Dec. 31, 2013 Unsecured domestic credit facility [Member] USD ($)	Dec. 31, 2014 Taiwan Unsecured Credit Facility [Member] USD ($)	Dec. 31, 2013 Taiwan Unsecured Credit Facility [Member] USD ($)	Jul. 31, 2013 Taiwan Unsecured Credit Facility [Member] USD ($)
Long-term debt
Borrowing capacity available for working capital and letter of credit purposes	$ 82,100,000																																						$ 2,600,000	2,600,000										$ 25,000,000		$ 10,000,000			$ 9,500,000	59,000,000.0	$ 5,500,000	34,200,000.0	$ 3,000,000				$ 12,000,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate																																							2.50%	2.50%			2.65%
Line of Credit Facility, Remaining Borrowing Capacity	74,900,000
Line of credit facility reamining capacity available for working captial	56,500,000
Debt, Long-term and Short-term, Combined Amount	16,200,000	26,600,000
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	3,972,000																			1,700,000							600,000	600,000					900,000	700,000
Long-term Debt							5,700,000	180,000,000										4,000,000	25,000,000				23,000,000
Debt Instrument, Periodic Payment, Principal			100,000	4,500,000																2,100,000	1,500,000						2,400,000	2,200,000									200,000	200,000
Debt Instrument, Interest Rate During Period			1.75%	1.75%	1.75%	1.75%									7.38%
Current portion of long-term debt	(3,972,000)	(7,850,000)
Borrowing capacity available for working capital need	57,300,000																																												3,200,000	20,000,000									6,300,000	39,000,000.0
Interest rate (as a percent)																																																					6.16%	6.60%							1.4376%	1.54%
Basis spread added to base rate (as a percent)			0.40%	0.40%											20.00%					2.44%	2.44%						2.27%	2.27%	2.27%	2.27%			2.46%	2.46%	2.48%	2.48%											2.44%	2.44%	2.75%	3.50%	5.00%		10.00%
Variable interest rate debt	16,225,000	26,635,000	900,000	27,000,000	1,500,000	45,000,000			2,965,000	4,191,000	0	1,486,000	13,260,000	20,958,000		1,500,000	9,000,000			6,800,000	10,100,000						1,200,000	1,200,000	4,200,000	3,700,000			5,300,000	4,400,000	6,700,000	4,900,000	2,100,000	2,100,000			2,700,000	2,400,000
Investment Owned, Pledged Flag																							65.00%
Debt instrument covenant equity as a percentage of total assets																																												35.00%
Debt instrument covenant fixed charge coverage ratio covenant compliance measured over specified period																				1.15
Debt instrument covenant current ratio																				1.00
Debt instrument covenant maximum consolidated total leverage ratio covenant compliance measured over specified period																				3.00
Debt instrument covenant threshold on annual capital expenditures																				10,000,000
Debt Conversion, Original Debt, Amount																								10,800,000
Debt Conversion, Converted Instrument, Amount																									3,800,000	3,800,000					6,000,000	5,000,000
Line of credit facility, amount outstanding																																																					0	0							0	0
Letters of Credit Outstanding, Amount	8,700,000	9,900,000																																													0	0											0	0
Long-term Debt, Maturities, Repayments of Principal in Year Two	5,832,000																			2,100,000							600,000	600,000					1,100,000	900,000
Long-term Debt, Maturities, Repayments of Principal in Year Three	3,134,000																			2,100,000													1,100,000	900,000
Long-term Debt, Maturities, Repayments of Principal in Year Four	3,287,000																			1,000,000													2,300,000	1,900,000
Mandatory principal payments as a percentage of net proceeds from sale of common stock																						25.00%	75.00%
Long-term debt	$ (12,253,000)	$ (18,785,000)