Note 5 - Revenue	6 Months Ended
Jun. 30, 2026
Statement Line Items [Line Items]
Disclosure of revenue [text block]	Note 5. Revenue During the three and six months ended June 30, 2026, no revenue has been recognized. In June 2025, the Gates Foundation awarded the Company a grant of $0.1 million to help the world eradicate polio (poliomyelitis) by exploring design options for a new and unique vaccine. During the three and six months ended June 30, 2025, the Company recognized a nominal amount of grant revenue related to the Gates Foundation Grant.

The entire disclosure for revenue.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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