Subsequent Events (Details)	0 Months Ended	12 Months Ended						1 Months Ended		12 Months Ended			0 Months Ended
	Oct. 31, 2013	Dec. 31, 2013 USD ($)	Dec. 31, 2013 Revolving domestic credit facility USD ($)	Dec. 31, 2012 Revolving domestic credit facility	Dec. 31, 2011 Revolving domestic credit facility USD ($)	May 31, 2013 Revolving domestic credit facility USD ($)	Dec. 31, 2009 Revolving domestic credit facility USD ($)	Dec. 31, 2012 Jiaxing line of credit facility USD ($)	Dec. 31, 2012 Jiaxing line of credit facility CNY	Dec. 31, 2013 Jiaxing line of credit facility	Jan. 06, 2014 Jiaxing line of credit facility USD ($)	Jan. 06, 2014 Jiaxing line of credit facility CNY	Mar. 12, 2014 Subsequent event USD ($)	Jan. 31, 2014 Subsequent event USD ($)	Jan. 31, 2014 Subsequent event CHF	Jan. 02, 2014 Subsequent event USD ($)	Jan. 07, 2014 Subsequent event Jiaxing line of credit facility USD ($)	Jan. 07, 2014 Subsequent event Jiaxing line of credit facility CNY
Subsequent events
Number of shares of common stock sold under the at-the-market stock offering program													776,636			166,247
Proceeds from sale of common stock		$ 8,884,000											$ 11,300,000			$ 2,300,000
Number of shares of common stock sold that were issued from treasury		610,389											703,509
Maximum borrowings available		58,000,000	2,500,000		25,000,000	25,000,000	10,000,000
Amount of term loan		23,000,000
Mandatory principal payments as a percentage of net proceeds from sale of common stock	75.00%	25.00%
Additional principal payments associated with the sale of common stock																1,300,000
Additional mandatory principal payments on term loan as a result of sale of Forkardt Swiss business														2,400,000	2,200,000
Borrowing capacity available for working capital and letter of credit purposes								5,600,000	34,200,000		5,600,000	34,200,000					9,700,000	59,000,000
Borrowing capacity available for working capital need								$ 3,300,000	20,000,000								$ 6,400,000	39,000,000
Interest rate (as a percent)			2.44%					6.60%	6.60%								6.60%	6.60%
Reference rate				one-month LIBOR	one-month LIBOR					basic interest rate							Basic interest rate	Basic interest rate
Basis spread added to bank's base rate (as a percent)				2.75%	3.50%					10.00%							10.00%	10.00%