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Income Taxes (Details) (USD $)	3 Months Ended
Income Taxes (Details) (USD $)	Jun. 30, 2012	Jun. 30, 2011
Income Taxes
Income tax expense	$ 1,771,000	$ 1,731,000
Income tax expenses related to foreign operations	1,700,000	2,500,000
State income tax expenses	100,000	100,000
U.S. federal income tax benefit related to a prior year settlement		$ 900,000

The component of income tax expense for the period representing amounts paid or payable (or refundable) as determined by applying the provisions of foreign enacted tax law to the foreign taxable Income or Loss from continuing operations.

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- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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