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Fair Value Measurements (Details) (USD $)
3 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Commitments and contingencies
Mar. 31, 2013
Commitments and contingencies
Reconciliation of liability measured at fair value        
Balance at the beginning of the period     $ 2,204,000  
Change in fair value included in net income     7,000  
Balance at the end of the period     2,211,000  
Fair value disclosure of liabilities        
Current portions of contingent consideration included within accrued liabilities     700,000 700,000
Non-financial assets measured at fair value        
Non-financial assets measured at fair value $ 0 $ 0