Investments (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Sep. 30, 2018	Jun. 30, 2018
Available-for-sale Debt Securities, Amortized Cost	$ 12,225	$ 15,072
Available-for-sale Equity Securities, Cost	5,294	6,316
Available-for-sale Debt Securities, Unrealized Gains	0	11
Available-for-sale Equity Securities, Unrealized Gains	295	511
Available-for-sale Debt Securities, Unrealized Losses	(2,568)	(1,702)
Available-for-sale Equity Securities, Unrealized Losses	(446)	(198)
Available-for-sale Debt Securities, Fair Value	9,657	13,381
Available-for-sale Equity Securities, Fair Value	5,143	6,629
Common Stock [Member]
Available-for-sale Equity Securities, Cost	4,217	5,239
Available-for-sale Equity Securities, Unrealized Gains	260	491
Available-for-sale Equity Securities, Unrealized Losses	(259)	(193)
Available-for-sale Equity Securities, Fair Value	4,218	5,537
Common stock warrants [Member]
Available-for-sale Equity Securities, Cost	288	288
Available-for-sale Equity Securities, Unrealized Gains	0	0
Available-for-sale Equity Securities, Unrealized Losses	(187)	(5)
Available-for-sale Equity Securities, Fair Value	101	283
Commercial Paper [Member]
Available-for-sale Debt Securities, Amortized Cost		3,294
Available-for-sale Debt Securities, Unrealized Gains		0
Available-for-sale Debt Securities, Unrealized Losses		0
Available-for-sale Debt Securities, Fair Value		3,294
Corporate Debt Securities [Member]
Available-for-sale Debt Securities, Amortized Cost	12,225	11,778
Available-for-sale Debt Securities, Unrealized Gains	0	11
Available-for-sale Debt Securities, Unrealized Losses	(2,568)	(1,702)
Available-for-sale Debt Securities, Fair Value	9,657	10,087
Mutual Fund [Member]
Available-for-sale Equity Securities, Cost	789	789
Available-for-sale Equity Securities, Unrealized Gains	35	20
Available-for-sale Equity Securities, Unrealized Losses	0	0
Available-for-sale Equity Securities, Fair Value	$ 824	$ 809

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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-Publisher FASB
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-Publisher FASB
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