Quarterly report pursuant to Section 13 or 15(d)

Note 16 - Subsequent Events (Details Textual)

v3.23.1
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