Senior Debt (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Debt (Textual) [Abstract]
Financial covenants which require compliance	Mar. 31, 2013
Maximum capital expenditures financial covenant	$ 2,500,000
Minimum fixed charge coverage ratio			2.5
Minimum Fixed Charge Coverage Ratio		1.25
Maximum funded debt to EBITDA covenant	3.0
Excess in aggregate indebtedness	100,000
Outstanding borrowings	0	0
Borrowing base limitation	14,600,000
Outstanding trade letters of credit	1,900,000
Credit agreement amended and restated effective date	Jun. 30, 2010
Extension of termination date of Line of Credit	Apr. 01, 2013
Extension of termination date of Term Loan	Apr. 01, 2014
Previous limit on letters of credit			5,000,000
Increased limit on letter of credit			10,000,000
Temporary Increase in Interest Rate			0.005
Reduction in interest rate due to trailing twelve month fixed charge ratio			0.50%
Maximum commitment under the Line of Credit	20,000,000
Amended fees paid	$ 23,000