Stock Options - Summary of activity of stock options (Details) (USD $)	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Shares outstanding, beginning	80,000	83,750	53,750
Number of shares granted	35,000		40,000
Number of shares exercised	(1,400)	(3,750)	(10,000)
Shares forfeited or expired
Shares outstanding, end	113,600	80,000	83,750
Options Vested	48,600
Options Exercisable	48,600
Options Outstanding, Weighted Average Exercise Price Per Share, beginning	$ 6.52	$ 6.42	$ 5.69
Options Outstanding, Weighted Average Exercise Price Per Share, end	$ 6.35	$ 6.52	$ 6.42
Options Outstanding, Weighted Aggregate Average Remaining Contract Life in Years	8 years 11 days	8 years 237 days	7 years 121 days
Options Outstanding, Intrinsic Value, beginning		$ 127,363	$ 401,200
Options Outstanding, Intrinsic Value, end	154,062		127,363
Options Granted, Weighted Average Exercise Price Per Share	$ 5.98		$ 6.80
Options Exercised, Weighted Average Exercise Price Per Share	$ 6.29	$ 4.35	$ 4.00
Options Forfeited or Expired, Weighted Average Exercise Price Per Share
Options Vested, Weighted Average Exercise Price Per Share	$ 6.46
Options Vested, Weighted Aggregate Average Remaining Contract Life in Years	6 years 336 days
Options Vested, Intrinsic Value	60,537
Options Exercisable, Weighted Average Exercise Price Per Share	$ 6.46
Options Exercisable, Weighted Aggregate Average Remaining Contract Life in Years	6 years 336 days
Options Exercisable, Intrinsic Value	$ 60,537