Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Details)

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Income Taxes (Details) (USD $)
3 Months Ended 6 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Income Taxes        
Income tax expense $ 1,787,000 $ 2,047,000 $ 3,558,000 $ 3,778,000
Income tax expenses related to foreign operations 1,787,000 2,200,000 3,500,000 4,800,000
State income tax expense (benefit)   (200,000) 100,000 (100,000)
U.S. federal income tax benefit related to a prior year settlement       $ (900,000)