Debt (Details)	12 Months Ended						12 Months Ended					0 Months Ended						0 Months Ended
	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2014 United States USD ($)	Dec. 31, 2014 United States Maximum USD ($)	Dec. 31, 2014 Europe Maximum USD ($)	Dec. 31, 2014 Revolving Credit Facility USD ($)	Dec. 31, 2013 Revolving Credit Facility USD ($)	May 18, 2012 Revolving Credit Facility USD ($)	Dec. 31, 2014 Revolving Credit Facility Other Assets USD ($)	Dec. 31, 2013 Revolving Credit Facility Other Assets USD ($)	Aug. 15, 2012 Revolving Credit Facility Base Rate	Aug. 15, 2012 Revolving Credit Facility Eurodollar Rate	Dec. 31, 2014 Domestic Line of Credit United States USD ($)	May 18, 2012 Domestic Line of Credit United States USD ($)	Dec. 31, 2014 Foreign Line of Credit Europe USD ($)	May 18, 2012 Foreign Line of Credit Europe USD ($)	Jul. 16, 2013 Foreign Line of Credit Japan	Dec. 31, 2014 Foreign Line of Credit Japan USD ($)	Jul. 16, 2013 Foreign Line of Credit Japan USD ($)	Jul. 16, 2013 Foreign Line of Credit Japan JPY (¥)	Dec. 31, 2014 Foreign Overdraft Line of Credit Japan USD ($)	Dec. 31, 2014 Foreign Overdraft Line of Credit Japan JPY (¥)	Dec. 31, 2013 Foreign Overdraft Line of Credit Japan USD ($)	Dec. 31, 2014 Standby Letters of Credit USD ($)	Dec. 31, 2013 Standby Letters of Credit USD ($)
Line of Credit Facility [Line Items]
Short-term debt	$ 18,900,000	$ 20,000,000
Maximum borrowing capacity									170,000,000						140,000,000		30,000,000
Outstanding loan amount when US and Europe borrowing base calculated quarterly	5,000,000
Line of credit facility, amount outstanding	8,000,000						500,000	100,000											7,900,000			2,500,000	300,000,000	0
Variable rate of interest during period							2.58%											2.70%
Current borrowing capacity	26,000,000													16,700,000		9,300,000			7,900,000	25,000,000	3,000,000,000
Basis spread on variable rate												1.00%	2.00%
Advances under credit facility borrowing base component					140,000,000	30,000,000
Borrowing base components, maximum percentage of eligible accounts receivable				85.00%
Borrowing base components, maximum percentage of eligible inventory				65.00%
Borrowing base components, maximum percentage of appraised net orderly liquidation value of eligible inventory				85.00%
Borrowing base components, maximum percentage of appraised fair market value of eligible real estate				60.00%
Borrowing base components, decrease of Original Real Estate Value each calendar month, percent	0.83%
Borrowing base components, maximum Original Real Estate Value				40,000,000
Consolidated fixed charge coverage ratio (not less than)							1.00
Covenant liquidity requirement														30,000,000
Debt issuance costs										0	400,000
Letters of credit outstanding, amount																									1,000,000	700,000
Line of credit facility, available amount																						5,000,000	600,000,000
Interest expense	2,600,000	2,500,000	2,900,000
Cash paid for interest	$ 1,800,000	$ 1,700,000	$ 2,400,000