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Debt (Details) (USD $)
 3 Months Ended 3 Months Ended 1 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Credit facility
tier
quarter
Jun. 30, 2012
Credit facility
Minimum
Jun. 30, 2012
Credit facility
Maximum
Jun. 30, 2012
Credit facility
LIBOR
Jun. 30, 2012
Credit facility
LIBOR
Minimum
Jun. 30, 2012
Credit facility
LIBOR
Maximum
Jun. 30, 2012
Credit facility
CBFR
Jun. 30, 2012
Credit facility
CBFR
Minimum
Jun. 30, 2012
Credit facility
CBFR
Maximum
Jun. 30, 2012
Letters of credit
Jun. 30, 2012
Letters of credit
LIBOR
Apr. 30, 2010
Reducing line of credit
Jun. 30, 2012
Revolving line of credit
Apr. 30, 2010
Revolving line of credit
Debt                              
Credit Facility $ 11,000,000                            
Long-term portion 11,000,000                            
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     CBFR              
Spread on variable rate (as a percent)           1.25% 2.00%   0.50% 1.25% 1.50%        
Description of variable rate basis used to calculate CBFR   Prime rate     One month LIBOR                    
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 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, numerator   2.5                          
Ratio of funded debt to EBIDTA required to be maintained, denominator   1.0                          
Fixed charge coverage ratio, required to be maintained, numerator   1.5                          
Fixed charge coverage ratio, required to be maintained, denominator   1.0                          
Fiscal year                              
2015 11,000,000                            
Credit Facility 11,000,000                            
Periodic principal amount                              
Required quarterly principal payment                         $ 250,000