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 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Revenue from contract with customer $ 9,000 $ 16,000 $ 24,000 $ 30,000
Royalty [Member]        
Revenue from contract with customer 8,920 5,940 24,141 9,090
Royalty [Member] | Diagnostics Segment [Member]        
Revenue from contract with customer 8,920 5,940 24,141 9,090
NAV4694 Sublicense [Member] | Diagnostics Segment [Member]        
Revenue from contract with customer 9,953 9,953
Product and Service, Other [Member] | Diagnostics Segment [Member]        
Revenue from contract with customer 11,024
Europe [Member] | Royalty [Member] | Diagnostics Segment [Member]        
Revenue from contract with customer $ 8,920 $ 5,940 $ 24,141 $ 9,090