Consolidated Statements of Shareholders' Equity (USD $)	Total	Common Stock	Capital in Excess of Par	Retained Earnings (deficit)
Beginning Balance, Value at Dec. 31, 2012	$ 6,102,700	$ 1,093,700	$ 5,502,600	$ (493,600)
Beginning Balance, Shares at Dec. 31, 2012	10,937,000	10,937,000
Stock-based compensation, Value	55,300	0	55,300	0
Stock-based compensation, Shares		0
Stock options exercised, Value	108,600	51,000	57,600	0
Stock options exercised, Shares		509,800
Net income	643,900	0	0	643,900
Ending Balance, Value at Dec. 31, 2013	6,910,500	1,144,700	5,615,500	150,300
Ending Balance, Shares at Dec. 31, 2013	11,446,800	11,446,800
Stock-based compensation, Value	66,700	0	66,700	0
Stock-based compensation, Shares		0
Stock options exercised, Value	41,900	10,300	31,600	0
Stock options exercised, Shares		102,989
Net income	2,093,400	0	0	2,093,400
Ending Balance, Value at Dec. 31, 2014	$ 9,112,500	$ 1,155,000	$ 5,713,800	$ 2,243,700
Ending Balance, Shares at Dec. 31, 2014	11,549,789	11,549,789