Note 7 - Revenue From Contracts With Customers - Contract Liability (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Balance $ 49 $ 3,244
In current period (49) (623)
In prior periods(1) [1]   (2,572)
Additions(2) [2] 1,237  
Balance $ 1,237 $ 49
[1] In May 2020, upon notification of early termination by Grünenthal, the Company recognized approximately $2.6 million of deferred revenue under the Grünenthal Agreements.
[2] Deferred revenue under the DZUVEO Agreement with Aguettant.