Long-Term Debt (Detail Textuals ) (USD $)				12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013 Line of credit	Dec. 31, 2012 Line of credit	Dec. 31, 2013 Industrial Development Revenue Bonds; secured by an equivalent letter of credit from a bank with interest payable monthly at a floating rate (0.30% at December 31, 2013) Letter of credit from bank
Debt Instrument [Line Items]
Annual sinking fund payments, commenced on December 1, 2000 through 2013				$ 170,000
Final sinking fund payment due December 1, 2014				2,620,000
Percentage of annual fee of secured amount				1.00%
Percentage of annual fee of principal amount outstanding				0.25%
Principal maturities of long-term debt for 2014	2,641,000
Principal maturities of long-term debt for 2015	21,000
Unsecured line of credit		$ 2,000,000	$ 2,000,000