Condensed Statements of Shareholders' Equity (Unaudited) (USD $)	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Beginning Balance at Dec. 31, 2013	$ 8,410	$ 50,381,348	$ 38,582,876	$ (21,115)	$ 88,951,519
Beginning Balance (in shares) at Dec. 31, 2013	8,410,493
Net income			1,728,869		1,728,869
Change in unrealized loss from interest rate swap				3,179	3,179
Common stock issued upon exercise of options (in shares)	50,292
Stock Issued During Period, Value, Stock Options Exercised	51	278,049			278,100
Tax benefit of stock option exercise		52,000			52,000
Stock- based compensation expense		102,809			102,809
Net income			1,728,869		1,728,869
Ending Balance at Mar. 31, 2014	8,461	50,814,206	40,311,745	(17,936)	91,116,476
Ending Balance (in shares) at Mar. 31, 2014	8,460,785
Beginning Balance at Dec. 31, 2014	8,501	51,440,770	13,373,601	(9,716)	64,813,156
Beginning Balance (in shares) at Dec. 31, 2014	8,500,555				8,500,555
Net income			928,120		928,120
Change in unrealized loss from interest rate swap				1,007	1,007
Common stock issued upon exercise of options (in shares)	25,352				55,000
Stock Issued During Period, Value, Stock Options Exercised	26	79,974			80,000
Tax benefit of stock option exercise		33,000			33,000
Stock- based compensation expense	13	273,027			273,040
Net income			928,120		928,120
Stock-based compensation expense (in shares)	12,835
Ending Balance at Mar. 31, 2015	$ 8,540	$ 51,826,771	$ 14,301,721	$ (8,709)	$ 66,128,323
Ending Balance (in shares) at Mar. 31, 2015	8,538,742				8,538,742