Condensed Statements Of Comprehensive Income (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Condensed Statements Of Comprehensive Income [Abstract]
NET INCOME	$ 6,278,613	$ 5,652,868	$ 12,247,694	$ 10,147,560
Defined benefit pension plan:
Amortization of prior service cost included in net periodic pension cost	4,368	4,368	8,735	8,735
Amortization of net loss included in net periodic pension cost	123,097	76,587	246,195	153,174
Total other comprehensive income	127,465	80,955	254,930	161,909
TOTAL COMPREHENSIVE INCOME	$ 6,406,078	$ 5,733,823	$ 12,502,624	$ 10,309,469