Investments (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
Dec. 31, 2018	Jun. 30, 2018
Available-for-sale Debt Securities, Amortized Cost	$ 16,920	$ 15,072
Available-for-sale Equity Securities, Cost	7,409	6,316
Available-for-sale Debt Securities, Unrealized Gains	0	11
Available-for-sale Equity Securities, Unrealized Gains	320	511
Available-for-sale Debt Securities, Unrealized Losses	(4,381)	(1,702)
Available-for-sale Equity Securities, Unrealized Losses	(1,993)	(198)
Available-for-sale Debt Securities, Fair Value	12,539	13,381
Available-for-sale Equity Securities, Fair Value	5,736	6,629
Common stock [Member]
Available-for-sale Equity Securities, Cost	6,175	5,239
Available-for-sale Equity Securities, Unrealized Gains	230	491
Available-for-sale Equity Securities, Unrealized Losses	(1,719)	(193)
Available-for-sale Equity Securities, Fair Value	4,686	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	(274)	(5)
Available-for-sale Equity Securities, Fair Value	14	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 [Member]
Available-for-sale Debt Securities, Amortized Cost	16,920	11,778
Available-for-sale Debt Securities, Unrealized Gains	0	11
Available-for-sale Debt Securities, Unrealized Losses	(4,381)	(1,702)
Available-for-sale Debt Securities, Fair Value	12,539	10,087
Mutual funds [Member]
Available-for-sale Equity Securities, Cost	946	789
Available-for-sale Equity Securities, Unrealized Gains	90	20
Available-for-sale Equity Securities, Unrealized Losses	0	0
Available-for-sale Equity Securities, Fair Value	$ 1,036	$ 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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