Description of Business (Credit Facility) (Details) (USD $)	3 Months Ended	12 Months Ended		1 Months Ended				6 Months Ended		19 Months Ended		0 Months Ended
	Dec. 31, 2011	Sep. 30, 2012 letter_of_credit	Nov. 11, 2010	Dec. 31, 2011 Revolving Credit Facility	Sep. 30, 2012 Revolving Credit Facility letter_of_credit	Jun. 30, 2012 Revolving Credit Facility	Dec. 07, 2012 Subsequent Event Revolving Credit Facility	Dec. 31, 2012 January 1, 2013	Dec. 31, 2012 January 1, 2013 Revolving Credit Facility	Jun. 14, 2012 July 1, 2012	Jun. 14, 2012 July 1, 2012 Revolving Credit Facility	Oct. 03, 2012 Issuance of Equity Subsequent Event
Line of Credit Facility [Line Items]
Maximum revolving credit amount			$ 35,000,000		$ 35,000,000
Excess availability financial covenant requirement, revised amount				3,500,000
First Amendment to Credit Facility:
Increase in eligible borrowing base	10,000,000			10,000,000
Eligible percentage of appraised value of equipment, original percentage amount				85.00%
Eligible percentage of appraised value of real estate, original percentage amount				50.00%
Excess availability financial covenant requirement, original amount				7,500,000
Additional rate added to LIBOR rate for outstanding borrowings				4.00%
Credit facility amendment condition, upon receipt of flood-related insurance proceeds in excess of this amount		30,000,000		30,000,000
Second Amendment to Credit Facility:
Line of credit facility, automatic borrowing base reduction, first amendment								3,100,000	3,100,000	8,100,000	8,100,000
Line of credit facility, automatic borrowing base reduction, second amendment								0	0	5,000,000	5,000,000
Eligible percentage of appraised value of equipment, revised percentage amount		0.00%
Eligible percentage of appraised value of real estate, revised percentage amount		0.00%
Credit Facility Disclosures:
Credit facility, amount outstanding					19,300,000
Credit facility, interest rate on outstanding balance		4.38%			4.40%
Credit facility, current amount outstanding							13,500,000
Standby letters of credit, total amount outstanding					2,400,000
Number of standby letters of credit outstanding		8			8
Credit facility, remaining borrowing capacity						5,200,000
Credit facility, expected availability amount over next twelve month period, as percentage of maximum revolving credit amount					70.00%
Common stock issued to underwriters (in shares)												1,832,410
Proceeds from issuance of common stock												$ 9,500,000