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Long-term Debt (Details) (USD $)
 12 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2013
Credit facility
quarter
tier
Mar. 31, 2013
Credit facility
Minimum
Mar. 31, 2013
Credit facility
Maximum
Mar. 31, 2013
Credit facility
LIBOR
Mar. 31, 2013
Credit facility
LIBOR
Minimum
Mar. 31, 2013
Credit facility
LIBOR
Maximum
Mar. 31, 2013
Credit facility
CBFR using bank prime rate
Mar. 31, 2013
Credit facility
CBFR using bank prime rate
Minimum
Mar. 31, 2013
Credit facility
CBFR using bank prime rate
Maximum
Mar. 31, 2013
Credit facility
CBFR using one month LIBOR
Mar. 31, 2013
Credit facility
CBFR using one month LIBOR
Minimum
Mar. 31, 2013
Credit facility
CBFR using one month LIBOR
Maximum
Mar. 31, 2013
Letters of credit
Apr. 30, 2010
Reducing line of credit
Apr. 30, 2013
Revolving line of credit
May 31, 2012
Revolving line of credit
Mar. 31, 2013
Revolving line of credit
Apr. 30, 2010
Revolving line of credit
Debt                                      
Line of credit $ 4,000,000                                 $ 4,000,000  
Long-term portion 4,000,000                                    
Effective rate of interest 1.50%                                    
Debt instrument, term   3 years                         36 months        
Maximum borrowing capacity                           1,000,000 3,000,000     20,000,000 4,000,000
Description of variable rate basis         LIBOR     Prime rate     One month LIBOR                
Spread on variable rate (as a percent)           1.25% 2.00%   (0.50%) (1.25%)   (0.50%) (1.25%)            
Spread on variable rate used to calculate CBFR (as a percent)                     2.50%                
Unused capacity fee (as a percent)     0.15% 0.30%                              
Number of trailing quarters of EBITDA used to calculate ratio of funded debt to EBITDA   4                                  
Number of defined tiers of ratio of funded debt to EBITDA   4                                  
High end of ratio of funded debt to the entity's trailing four quarters of EBIDTA for unused capacity fees     2                                
Low end of ratio of funded debt to the entity's trailing four quarters of EBIDTA for unused capacity fees       1                              
Ratio of funded debt to EBIDTA required to be maintained   2.5                                  
Fixed charge coverage ratio, required to be maintained     1.5                                
Borrowings for facilitating acquisition                                 11,000,000    
Principal repayments                               1,000,000   7,000,000  
Fiscal year                                      
2015 4,000,000                                    
Line of credit 4,000,000                                 4,000,000  
Periodic principal amount                                      
Required quarterly principal payment                             $ 250,000