Note 6 - Prepaid Expenses - Summary of Prepaid Expenses (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Prepaid director and officer liability insurance	$ 21	$ 30
Prepaid supplies	120	190
Prepaid software subscriptions	189	50
Prepaid consulting contracts	3	25
Prepaid research and development costs	0	40
Other	191	11
Total prepaid expenses and other current assets	524	346
Continuing and Discontinued Operations [Member]
Total prepaid expenses and other current assets	$ 524	$ 346