Note 1 - Significant Accounting Policies - Schedule of Antidilutive Securities Excluded From Earnings Per Share (Details) - shares shares in Thousands	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Antidilutive securities (in shares)	67,460	53,718
Share-Based Payment Arrangement, Option [Member]
Antidilutive securities (in shares)	24,380	23,215
Warrant [Member]
Antidilutive securities (in shares)	10,346	10,346
Convertible Debt Securities [Member]
Antidilutive securities (in shares)	32,734	20,157

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257

Name:	us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration