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Note 8 - Commitments
 3 Months Ended
Mar. 31, 2019
Notes to Financial Statements  
Commitments Disclosure [Text Block]
8.
     Commitments
 
Lease Agreement
 
We lease approximately
8,400
square feet of office and laboratory space pursuant to an operating lease which expires on
December 31, 2019,
with annual extension options through
December 31, 2022.
Rent expense for the for the
three
-month periods ended
March 31, 2019
and
2018
was
$40,316
and
$39,136,
respectively. Future minimum lease payments total
$120,949
for the remainder of
2019.
Our current intention is to exercise our option to extend the lease at least for the subsequent
one
-year renewal period, subject to our landlord’s right to cancel the extension period
90
days prior to its commencement.
 
Other Commitments
 
In the normal course of business, we enter into various firm purchase commitments related to production and testing of our vaccine, conduct of research studies, and other activities. As of
March 31, 2019,
there are approximately
$487,000
of unrecorded outstanding purchase commitments to our vendors and subcontractors, all of which we expect will be due in
2019.
We expect this entire amount to be reimbursable to us pursuant to existing government grants.