Note 12 - Grants and Collaboration Revenue

3 Months Ended

Mar. 31, 2021

Government Grants and Contracts [Text Block]

12.	Grants and Collaboration Revenue

We receive payments from government entities under grants from the National Institute of Allergy and Infectious Diseases (NIAID) and from the U.S. Department of Defense in support of our vaccine research and development efforts. We record revenue associated with government grants as the reimbursable costs are incurred. During the

three

-month periods ended

March 31, 2021

and

2020,

we recorded

$110,417

and

$654,021,

respectively, of revenues associated with these grants. During the

three

-month period ended

March 31, 2020,

we also recorded

$61,956

of revenue associated with a research collaboration agreement with Leidos, Inc. As of

March 31, 2021,

there is an aggregate of

$355,010

in approved grant funds available for use during

2021.