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Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Consolidated Statements of Comprehensive Income (Loss) (Unaudited) [Abstract]
Net income (loss)	$ 3,513,000	$ 5,595,000	$ (1,982,000)	$ 13,415,000
Other comprehensive (loss) income, net of tax:
Unrealized gain on short-term investments (net of tax of $0, $40,000, $0 and $78,000)	0	60,000	0	116,000
Foreign currency translation (loss) gain	(2,000)	608,000	(717,000)	837,000
Total other comprehensive (loss) gain, net of tax	(2,000)	668,000	(717,000)	953,000
Comprehensive income (loss)	$ 3,511,000	$ 6,263,000	$ (2,699,000)	$ 14,368,000

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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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