4. Earnings Per Share (Detail) - Schedule of earnings per share, basic and diluted (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net income (in Dollars)	$ 490,452	$ 541,000	$ 966,013	$ 821,205
Shares used in calculation of income per share:
Basic	4,809,469	4,628,632	4,744,322	4,595,196
Effect of dilutive options	227,820	319,405	228,726	334,798
Diluted	5,037,289	4,948,037	4,973,048	4,929,994
Net income per share:
Basic (in Dollars per share)	$ 0.10	$ 0.12	$ 0.20	$ 0.18
Diluted (in Dollars per share)	$ 0.10	$ 0.11	$ 0.19	$ 0.17