Note 1 - Nature of Business and Basis of Presentation (Details Textual) $ in Millions	51 Months Ended
Jun. 30, 2022 USD ($)
Proceeds from Issuance or Sale of Equity, Total	$ 329
Cash and Marketable Securities	$ 132

The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3255-108585

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration