Quarterly report pursuant to Section 13 or 15(d)

Note 3 - Revenue From Contracts With Customers - Disaggregation of Revenue (Details)

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Note 3 - Revenue From Contracts With Customers - Disaggregation of Revenue (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Revenue from contract with customer $ 9,000 $ 7,000 $ 45,000 $ 31,000
Royalty [Member]        
Revenue from contract with customer 0 2,047 0 26,188
Diagnostics Segment [Member] | Royalty [Member]        
Revenue from contract with customer   2,047   26,188
Diagnostics Segment [Member] | Royalty [Member] | Europe [Member]        
Revenue from contract with customer 0 2,047 0 26,188
Diagnostics Segment [Member] | Expanded Tc99m Tilmanocept License Agreement [Member] | Europe [Member]        
Revenue from contract with customer $ 9,116 $ 4,726 $ 44,665 $ 4,726