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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Consolidated Statements of Comprehensive Income (Unaudited) [Abstract]
Net income	$ 6,301,000	$ 9,143,000	$ 13,927,000	$ 16,651,000
Other comprehensive income (loss), net of tax:
Unrealized gain on short-term investments (net of tax of $40,000, $44,000, $78,000, and $59,000)	60,000	66,000	116,000	88,000
Foreign currency translation gain (loss)	608,000	(807,000)	837,000	(1,342,000)
Total other comprehensive gain (loss), net of tax	668,000	(741,000)	953,000	(1,254,000)
Comprehensive income	$ 6,969,000	$ 8,402,000	$ 14,880,000	$ 15,397,000

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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.

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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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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature, attributable to parent entity.

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