Note 10 - Collaborative and Other Research and Development Contracts 2 (Details Textual) - Torii Pharmaceutical Co. [Member] - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01 $ in Thousands |
Dec. 31, 2019
USD ($)
|
---|---|
Revenue, Remaining Performance Obligation, Amount | $ 1,899 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 1 year |