Condensed Statements Of Comprehensive Income (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Condensed Statements Of Comprehensive Income [Abstract]
NET INCOME	$ 5,969,081	$ 4,494,692
Other comprehensive income:
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	123,098	76,587
Total other comprehensive income	127,465	80,954
TOTAL COMPREHENSIVE INCOME	$ 6,096,546	$ 4,575,646