Reconciliation of Segment Operating Income (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Reconciliation Of Segment Operating Income Details
Total operating income									$ 5,879,096	$ 5,360,520
Interest expense, net									350,334	264,398
Other expense, net									34,871	99,076
Consolidated income before taxes									5,493,891	4,997,046
Net income	$ 524,000	$ 959,000	$ 2,211,000	$ 309,000	$ 430,000	$ 798,000	$ 2,061,000	$ 260,000	$ 4,002,905	$ 3,549,231