Statements of Stockholders' Equity - USD ($)	Common Stock [Member]	Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2013	$ 1,600	$ 14,780,100	$ 31,857,300	$ (504,100)	$ 46,134,900
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	0	0	(11,294,000)	0	(11,294,000)
Balance at Dec. 31, 2014	1,600	14,780,100	20,563,300	(504,100)	34,840,900
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	0	0	6,437,600	0	6,437,600
Balance at Dec. 31, 2015	$ 1,600	$ 14,780,100	$ 27,000,900	$ (504,100)	$ 41,278,500