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Note 11 - Other Income (Expense) (Details Textual) - USD ($) $ in Millions | 3 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020
CCXI [Member] |  |
Unrealized Gain (Loss) on Investments, Total | $ 5.3 | $ (4.4)

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- Definition Amount of unrealized gain (loss) on investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |