Long-Term Debt (Detail Textuals 1) (USD $)	9 Months Ended
	Sep. 30, 2012
Letter Of Credit From Bank
Debt Instrument [Line Items]
Percentage Of Annual Fee Of Secured Amount	1.00%
Percentage Of Annual Fee Of Principal Amount Outstanding	0.25%
Line of Credit | Minimum
Debt Instrument [Line Items]
increase in unsecured line of credit	$ 1,000,000
Line of Credit | Maximum
Debt Instrument [Line Items]
increase in unsecured line of credit	2,000,000
Industrial Development Revenue Bonds; secured by an equivalent letter of credit from a bank with interest payable monthly at a floating rate (0.43% at September 30, 2012)
Debt Instrument [Line Items]
Annual sinking fund payments commenced December 1, 2000 through 2013	170,000
Final Sinking Fund Payment Due December 1, 2014	$ 2,620,000