Goodwill (Details) (USD $)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Balance at beginning of year
Goodwill	$ 5,716,327	$ 5,659,979
Accumulated goodwill impairment losses	(25,393)	(25,393)
Goodwill acquired during the year	205,354	56,348
Impairment losses	0	0
Balance at end of year
Goodwill	5,921,681	5,716,327
Accumulated goodwill impairment losses	(25,393)	(25,393)
Goodwill, net	$ 5,896,288	$ 5,690,934	$ 5,634,586