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Line of Credit (Details) (First Hawaiian Bank, Line of credit, USD $)
12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 22, 2011
First Hawaiian Bank | Line of credit
     
Line of credit      
Maximum amount under agreement     $ 350,000
Variable rate basis prime    
Interest rate added to variable rate (as a percent) 2.00%    
Outstanding balance   $ 0  
Weighted average interest rate (as a percent) 5.25%