Note 3 - Revenue From Contracts With Customers - Disaggregation of Revenue (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenue from contract with customer	$ 15,000	$ 14,000
Royalty [Member]
Revenue from contract with customer	15,221	3,150
Royalty [Member] | Diagnostics Segment [Member]
Revenue from contract with customer	15,221	3,150
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	$ 15,221	$ 3,150