STATEMENTS OF STOCKHOLDERS' EQUITY (USD $)	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Total
Balance at Dec. 31, 2012	$ 79,464	$ 28,795,496	$ (25,043,948)	$ 3,831,012
Balance (in shares) at Dec. 31, 2012	7,946,462
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	0	0	293,572	293,572
Cash dividend paid	0	0	(397,935)	(397,935)
Exercise of stock options	121	6,379	0	6,500
Exercise of stock options (in shares)	12,102
Stock-based compensation	0	146,234	0	146,234
Tax benefit from stock option plans	0	10,539	0	10,539
Balance at Dec. 31, 2013	79,585	28,958,648	(25,148,311)	3,889,922
Balance (in shares) at Dec. 31, 2013	7,958,564			7,958,564
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	0	0	370,554	370,554
Cash dividend paid	0	0	(402,450)	(402,450)
Exercise of stock options	968	(917)	0	51
Exercise of stock options (in shares)	96,801
Stock-based compensation	0	125,519	0	125,519
Tax benefit from stock option plans	0	92,790	0	92,790
Balance at Dec. 31, 2014	$ 80,553	$ 29,176,040	$ (25,180,207)	$ 4,076,386
Balance (in shares) at Dec. 31, 2014	8,055,365			8,055,365