Condensed Statements Of Comprehensive Income (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Condensed Statements Of Comprehensive Income [Abstract]
NET INCOME	$ 3,690,846	$ 5,969,081
Defined benefit pension plan:
Amortization of prior service cost included in net periodic pension cost	4,367	4,367
Amortization of net loss included in net periodic pension cost	165,884	123,098
Total other comprehensive income	170,251	127,465
TOTAL COMPREHENSIVE INCOME	$ 3,861,097	$ 6,096,546