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Stock Options (Details) (USD $)
 12 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2012
Mar. 31, 2013
$1.800 to $6.345 [Member]
Mar. 31, 2013
$6.460 to $7.450 [Member]
Mar. 31, 2013
$8.700 to $9.900 [Member]
Mar. 31, 2013
$10.010 to $11.900 [Member]
Mar. 31, 2013
$12.000 to $15.060 [Member]
Mar. 31, 2013
1994 Stock Option Plan [Member]
Mar. 31, 2012
1994 Stock Option Plan [Member]
Nov. 08, 2002
1994 Stock Option Plan [Member]
Mar. 31, 2002
1994 Stock Option Plan [Member]
Mar. 31, 2013
2003 Long-Term Incentive Plan [Member]
Mar. 31, 2012
2003 Long-Term Incentive Plan [Member]
Dec. 17, 2003
2003 Long-Term Incentive Plan [Member]
Mar. 31, 2013
2004 Non-Employee Director Stock Option Plan [Member]
Mar. 31, 2012
2004 Non-Employee Director Stock Option Plan [Member]
Feb. 25, 2010
2004 Non-Employee Director Stock Option Plan [Member]
Feb. 24, 2010
2004 Non-Employee Director Stock Option Plan [Member]
Mar. 31, 2013
2010 Incentive Award Plan [Member]
Mar. 28, 2013
2010 Incentive Award Plan [Member]
Mar. 27, 2013
2010 Incentive Award Plan [Member]
Mar. 31, 2012
2010 Incentive Award Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                
Aggregate number of stock options approved (in shares)                       1,155,000 960,000     1,200,000     275,000 175,000   1,750,000 750,000  
Term and vesting period of options granted                   10 years                            
Option to purchase common stock, outstanding (in shares) 1,970,084 1,462,284 1,591,084             95,750       1,035,534 1,035,534   218,000 203,000     620,800     0
Options available for grant (in shares)                   0 0     0 0   57,000 72,000     1,078,033      
Incentive plan, expiration date Oct. 31, 2013                                              
Number of Shares [Roll Forward]                                                
Outstanding at beginning of period (in shares) 1,462,284 1,591,084 1,628,334             223,750       1,035,534 1,035,534   218,000 203,000     620,800     0
Granted (in shares) 635,800 15,000 18,000                                          
Exercised (in shares) (128,000) (95,550) (52,250)                                          
Cancelled (in shares) 0 (48,250) (3,000)                                          
Outstanding at end of period (in shares) 1,970,084 1,462,284 1,591,084             95,750       1,035,534 1,035,534   218,000 203,000     620,800     0
Weighted Average Exercise Price [Roll Forward]                                                
Outstanding at beginning of period (in dollars per share) $ 9.15 $ 8.61 $ 8.45                                          
Granted (in dollars per share) $ 6.47 $ 10.04 $ 9.61                                          
Exercised (in dollars per share) $ 2.28 $ 3.36 $ 3.83                                          
Cancelled (in dollars per share) $ 0 $ 3.15 $ 11.00                                          
Outstanding at end of period (in dollars per share) $ 8.73 $ 9.15 $ 8.61                                          
Pre-tax intrinsic value of options exercised $ 493,000 $ 598,000 $ 530,000                                          
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]                                                
Outstanding options, shares (in shares) 1,970,084       178,750 716,800 300,200 359,334 415,000                              
Outstanding options, weighted average exercise price (in dollars per share)         $ 5.82 $ 6.57 $ 9.12 $ 10.21 $ 12.14                              
Outstanding options, weighted average remaining life (in years)         3 years 8 years 11 months 26 days 1 year 4 months 6 days 2 years 9 months 25 days 3 years 6 months 11 days                              
Outstanding options, aggregate intrinsic value 55,412       55,412 0 0 0 0                              
Exercisable options, shares (in shares) 1,549,683       176,750 302,399 298,200 359,334 413,000                              
Exercisable options, weighted average exercise price (in dollars per share)         $ 5.84 $ 6.71 $ 9.11 $ 10.21 $ 12.13                              
Exercisable options, aggregate intrinsic value 51,258       51,258 0 0 0 0                              
Closing stock price $ 6.13     $ 7.75                                        
Number of stock options exercisable (in shares) 1,549,683 1,447,284 1,576,084                                          
Weighted average exercise price of stock options exercisable (in dollars per share) $ 9.33 $ 9.14 $ 8.61                                          
Number of Shares [Roll Forward]                                                
Non-vested at beginning of period (in shares) 15,000                                              
Granted (in shares) 635,800 15,000 18,000                                          
Vested (in shares) (230,399)                                              
Non-vested at end of period (in shares) 420,401 15,000                                            
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 $ 4.21 $ 3.82                                          
Vested (in dollars per share) $ 2.98                                              
Non-vested at end of period (in dollars per share) $ 2.93 $ 4.18                                            
Total unrecognized compensation expense $ 1,059,000                                              
Weighted average vesting period over which compensation expense is expected to be recognized 2 years 1 month 6 days