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Net Income per Common Share (Details Textual)
3 Months Ended 6 Months Ended
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Out Of Money Stock Options [Member]
     
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 25,000 97,000 25,000
In Money Stock Options [Member]
     
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount   25,000