Financing Arrangements, Lines of credit (Details) (USD $)	12 Months Ended					3 Months Ended	12 Months Ended							12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Line of Credit [Member] Bank of America [Member]	Oct. 03, 2013 Line of Credit [Member] Bank of America [Member]	Mar. 31, 2009 Line of Credit [Member] EJ Funds, LP [Member]	Dec. 31, 2013 Line of Credit [Member] EJ Funds, LP [Member] Director	Dec. 31, 2011 Line of Credit [Member] EJ Funds, LP [Member]	Aug. 17, 2009 Line of Credit [Member] EJ Funds, LP [Member]	Apr. 13, 2009 Line of Credit [Member] EJ Funds, LP [Member]	Mar. 01, 2009 Line of Credit [Member] EJ Funds, LP [Member]	Feb. 19, 2009 Line of Credit [Member] EJ Funds, LP [Member]	Jan. 07, 2009 Line of Credit [Member] EJ Funds, LP [Member]	Dec. 31, 2013 Letter of Credit [Member] Bank of America [Member]
Line of Credit Facility [Line Items]
Borrowing capacity					$ 20,000,000				$ 10,000,000		$ 25,000,000		$ 5,700,000	$ 2,000,000
Maximum borrowing capacity				60,000,000
Maturity date				Mar. 01, 2016
Required notice of termination				90 days
Basis spread on federal funds rate (in hundredths)				0.50%
Description of variable rate basis				LIBOR
Basis spread on variable rate (in hundredths)				1.00%
Unused line fee (in hundredths)				0.25%
Letter of credit facility, commitment fee percentage (in hundredths)														0.125%
Increase in fee during an event of default (in hundredths)				2.00%										2.00%
Percentage of respective equity interests in any foreign subsidiary (in hundredths)				65.00%
Fixed charge coverage ratio				1.1
Percentage of Lender's commitment (in hundredths)				15.00%
Borrowing availability				59,100,000
Outstanding amount												5,500,000		500,000
Interest rate (in hundredths)						10.00%
Number of required Directors							2
Warrants granted (in shares)									1,650,806	1,939,639
Warrant exercise price (in dollars per share)									$ 1.16	$ 1.11
Expiration of warrant							5 years
Restatement warrants fair value									1,200,000
Other associated costs capitalized as financing costs									7,000
Unamortized deferred financing cost expensed	$ 842,000	$ 782,000	$ 1,948,000					$ 1,200,000