CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $)	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock
Balance at Dec. 31, 2009	$ 112,504,422	$ 190,963	$ 30,041,083	$ 131,137,355	$ (48,864,979)
Balance (in shares) at Dec. 31, 2009		16,125,388
Increase (Decrease) in Stockholders' Equity
Exercise of stock options, including related tax benefit	99,843		(223,473)		323,316
Exercise of stock options, including related tax benefit (in shares)		12,770
Share based compensation expense	1,741,083		1,741,083
Net income	8,236,261			8,236,261
Balance at Dec. 31, 2010	122,581,609	190,963	31,558,693	139,373,616	(48,541,663)
Balance (in shares) at Dec. 31, 2010		16,138,158
Increase (Decrease) in Stockholders' Equity
Share based compensation expense	1,619,652		1,619,652
Accounting change for base jackpots	638,865			638,865
Net income	5,675,854			5,675,854
Balance at Dec. 31, 2011	130,515,980	190,963	33,178,345	145,688,335	(48,541,663)
Balance (in shares) at Dec. 31, 2011	16,138,158	16,138,158
Increase (Decrease) in Stockholders' Equity
Exercise of stock options, including related tax benefit	52,994		(182,623)		235,617
Exercise of stock options, including related tax benefit (in shares)		9,166
Share based compensation expense	1,367,968		1,367,968
Net income	8,910,848			8,910,848
Balance at Dec. 31, 2012	$ 140,847,790	$ 190,963	$ 34,363,690	$ 154,599,183	$ (48,306,046)
Balance (in shares) at Dec. 31, 2012	16,147,324	16,147,324