Quarterly report pursuant to Section 13 or 15(d)

Note 16 - Subsequent Events (Details Textual)

Note 16 - Subsequent Events (Details Textual) - USD ($)	May 09, 2023	May 05, 2023	May 03, 2023	Apr. 26, 2023	Apr. 10, 2023	Apr. 25, 2023	Mar. 31, 2023
Maximum [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights							$ 49.80
Warrants and Rights Outstanding, Term							4 years 4 months 24 days
Subsequent Event [Member]
Share Price						$ 0.25
Class of Warrant or Right, Exercise Price of Warrants or Rights				$ 0.16
Subsequent Event [Member] \| Milestone Warrant [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights				$ 0.50
Warrants and Rights Outstanding, Term				5 years
Subsequent Event [Member] \| Lymphoseek [Member]
Minimum Sales Amount Threshold				$ 100,000,000
Milestone Achievement, Purchase Price				8,000,000
Subsequent Event [Member] \| Keystone [Member]
Milestone Payment Receivable				$ 10,000,000
Subsequent Event [Member] \| Series I Preferred Stock [Member]
Preferred Stock, Convertible, Conversion Price				$ 0.16
Preferred Stock, Convertible, Shares Issuable				6,250
Stock Issued, Shares, Milestone Payment				10,000
Subsequent Event [Member] \| Purchase Agreement [Member] \| Keystone [Member]
Maximum Amount Shares Issuable				$ 2,750,000
Stock Issuable as Consideration for Purchase Commitment				400,000
Stock Issued as Consideration for Purchase Commitment, Delivered Right Away				200,000
Stock Issued as Consideration for Purchase Commitment, Delivered When Milestone Achieved				200,000
Minimum Amount Raised Required for Shares to be Delivered				$ 2,750,000
Stock Issued During Period, Shares, New Issues		626,911	284,090
Shares Issued, Price Per Share		$ 0.16	$ 0.18
Proceeds from Issuance of Common Stock		$ 100,000	$ 50,000
Subsequent Event [Member] \| The 2023 Bridge Note [Member] \| Vice Chairman of Board of Directors [Member]
Proceeds from Issuance of Long-Term Debt	$ 75,000			$ 225,000
Debt Instrument, Fee Amount						$ 15,000
Subsequent Event [Member] \| The 2023 Bridge Note [Member] \| Vice Chairman of Board of Directors [Member] \| Maximum [Member]
Debt Instrument, Face Amount						$ 300,000
The Business [Member] \| Subsequent Event [Member]
Proceeds from Divestiture of Businesses					$ 250,000
Disposal Group, Including Discontinued Operation, Consideration Receivable Within 60 Days After Closing Date					$ 500,000