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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Revenue from contract with customer $ 16,000 $ 264,000 $ 30,000 $ 265,000
Royalty [Member]        
Revenue from contract with customer 5,940 6,665 9,090 7,460
Royalty [Member] | Diagnostics Segment [Member]        
Revenue from contract with customer 5,940 6,665 9,090 7,460
License [Member]        
Revenue from contract with customer 9,953 257,709 9,953 257,709
License [Member] | Diagnostics Segment [Member]        
Revenue from contract with customer 9,953 257,709 9,953 257,709
Product and Service, Other [Member] | Diagnostics Segment [Member]        
Revenue from contract with customer     11,024 15,037
Europe [Member] | Royalty [Member] | Diagnostics Segment [Member]        
Revenue from contract with customer $ 5,940 $ 6,665 $ 9,090 $ 7,460