Share-Based Compensation (Details 2) (USD $)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Shares
Outstanding at the end of the period (in shares)	1,495,856
Stock options
Shares
Outstanding at the beginning of the period (in shares)	1,251,166	426,650	333,606
Granted (in shares)	258,000	922,516	230,000
Exercised (in shares)	(9,970)	(37,800)	(132,596)
Forfeited or Expired (in shares)		(59,450)	(4,360)
Forfeited (in shares)	(3,340)
Expired (in shares)		(750)
Outstanding at the end of the period (in shares)	1,495,856	1,251,166	426,650	333,606
Exercisable at the end of the period (in shares)	338,290
Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 3.54	$ 2.49	$ 1.69
Granted (in dollars per share)	$ 6.30	$ 3.87	$ 3.04
Exercised (in dollars per share)	$ 2.34	$ 1.82	$ 1.41
Forfeited or Expired (in dollars per share)		$ 2.14	$ 2.12
Forfeited (in dollars per share)	$ 3.21
Expired (in dollars per share)		$ 4.20
Outstanding at the end of the period (in dollars per share)	$ 4.03	$ 3.54	$ 2.49	$ 1.69
Exercisable at the end of the period (in dollars per share)	$ 3.12
Weighted Average Remaining Contractual Term
Outstanding at the end of the period	8 years 3 months 18 days	9 years	8 years 9 months 18 days	8 years 4 months 24 days
Exercisable at the end of the period	7 years 7 months 6 days
Aggregate Intrinsic Value
Outstanding at the end of the period (in dollars)	$ 1,174,810	$ 8,243,956	$ 395,693	$ 555,281
Exercisable at the end of the period (in dollars)	470,790
Closing stock price for last business day (in dollars per share)	$ 4.47
Total intrinsic value of options exercised	37,000	147,000	264,000
Nonvested Options, Shares
Nonvested at the beginning of the period (in shares)	1,109,066
Granted (in shares)	258,000	922,516	230,000
Vested (in shares)	(206,560)
Forfeited (in shares)	(2,940)
Nonvested at the end of the period (in shares)	1,157,566	1,109,066
Nonvested Options, Weighted Average Grant-Date Fair Value
Nonvested at the beginning of the period (in dollars per share)	$ 2.57
Granted (in dollars per share)	$ 4.35
Vested (in dollars per share)	$ 2.10
Forfeited (in dollars per share)	$ 2.14
Nonvested at the end of the period (in dollars per share)	$ 3.05	$ 2.57
Fair value of stock awards
Weighted average grant-date fair value of stock awards granted	1,124,000	2,528,000	487,000
Total grant-date fair values of stock awards vested	$ 434,000	$ 234,000	$ 66,000