Statements of Stockholders' Equity (USD $)	Common Stock [Member]	Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2011	$ 1,600	$ 14,780,100	$ 26,412,600	$ (504,100)	$ 40,690,200
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	0	0	5,189,000	0	5,189,000
Balance at Dec. 31, 2012	1,600	14,780,100	31,601,600	(504,100)	45,879,200
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	0	0	3,217,500	0	3,217,500
Balance at Dec. 31, 2013	$ 1,600	$ 14,780,100	$ 34,819,100	$ (504,100)	$ 49,096,700