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Stock Options (Details) (USD $)
 3 Months Ended 9 Months Ended
Dec. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Summary of Black-Scholes option pricing model assumptions used to derive weighted average fair value of stock options granted [Abstract]      
Weighted average risk free interest rate (in hundredths)   1.16% 2.30%
Weighted average expected holding period (years)   6 years 7 months 6 days 6 years 1 month 24 days
Weighted average expected volatility (in hundredths)   44.25% 39.02%
Weighted average expected dividend yield (in hundredths)   0.00% 0.00%
Weighted average fair value of options granted (in dollars per share)   $ 2.92 $ 5.95
Number of Shares [Roll Forward]      
Outstanding at beginning of period (in shares)   1,462,284  
Granted (in shares) 626,800 632,800 6,000
Exercised (in shares)   (26,500)  
Cancelled (in shares)   0  
Outstanding at end of period (in shares) 2,068,584 2,068,584  
Weighted Average Exercise Price [Roll Forward]      
Outstanding at beginning of period (in dollars per share)   $ 9.15  
Granted (in dollars per share)   $ 6.47  
Exercised (in dollars per share)   $ 2.75  
Cancelled (in dollars per share)   $ 0  
Outstanding at end of period (in dollars per share) $ 8.41 $ 8.41  
Number of stock options exercisable (in shares) 1,648,183 1,648,183  
Weighted average exercise price of stock options exercisable (in dollars per share) $ 8.89 $ 8.89  
Number of Shares [Roll Forward]      
Non-vested at beginning of period (in shares)   15,000  
Granted (in shares) 626,800 632,800 6,000
Vested (in shares)   (227,399)  
Non-vested at end of period (in shares) 420,401 420,401  
Weighted Average Grant Date Fair Value [Roll Forward]      
Non-vested at beginning of period (in dollars per share)   $ 4.18  
Granted (in dollars per share)   $ 2.92 $ 5.95
Vested (in dollars per share)   $ 2.97  
Non-vested at end of period (in dollars per share) $ 2.94 $ 2.94  
Total unrecognized compensation expense $ 1,193,000 $ 1,193,000  
Weighted average vesting period over which compensation expense is expected to be recognized   2 years 4 months 24 days