Condensed Statements Of Comprehensive Income (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Condensed Statements Of Comprehensive Income [Abstract]
NET INCOME	$ 3,404,003	$ 4,267,252	$ 11,112,560	$ 16,514,946
Defined benefit pension plan:
Amortization of prior service cost included in net periodic pension cost	4,367	4,367	13,102	13,102
Amortization of net loss included in net periodic pension cost	165,884	123,098	497,652	369,293
Total other comprehensive income	170,251	127,465	510,754	382,395
TOTAL COMPREHENSIVE INCOME	$ 3,574,254	$ 4,394,717	$ 11,623,314	$ 16,897,341