Note 10 - Commitments and Contingencies

6 Months Ended

Jun. 30, 2022

Notes to Financial Statements

Commitments and Contingencies Disclosure [Text Block]

Note 10. Commitments and Contingencies

Office Leases

We have long-term operating leases for office, industrial and laboratory space in Westminster, California, Oak Ridge, Tennessee, and Alberta, Canada. Payments made under operating leases are charged to the Consolidated Statement of Operations and Comprehensive Loss on a straight-line basis over the term of the operating lease agreement. For the six months ended  June 30, 2022 and 2021, rental expense was $169,000 and $114,000, respectively.  As of  June 30, 2022, our weighted average remaining lease term is four years and the total remaining operating lease payments is $580,000.