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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)	3 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Consolidated Statements of Comprehensive Income (Unaudited) [Abstract]
Net income	$ 7,626,000	$ 7,508,000
Other comprehensive income (loss), net of tax:
Unrealized gain on short-term investments (net of tax of $38,000, and $15,000)	56,000	22,000
Foreign currency translation gain (loss)	229,000	(535,000)
Total other comprehensive gain (loss), net of tax	285,000	(513,000)
Comprehensive income	$ 7,911,000	$ 6,995,000

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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