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Changes in Stockholders' Equity and Comprehensive Income (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Stockholders Equity Note [Abstract]
Net income	$ 3,952	$ 4,837
Net change in unrealized gain on short term investments	9	46
Net change in unrealized gain on redemptions of long term investments		47
Comprehensive income	$ 3,961	$ 4,930

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- Definition

Net of tax amount of unrealized holding gain (loss) before reclassification adjustments and transfers on long term available-for-sale securities.

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The change in unrealized holding gain (loss), net of tax, on available-for-sale securities included in a separate component of shareholders' equity during the period.

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-Publisher FASB

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The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Reference 7: http://www.xbrl.org/2003/role/presentationRef

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Reference 8: http://www.xbrl.org/2003/role/presentationRef

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