Note 4 - Prepaid Expenses and Other Current Assets - Summary of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Prepaid insurance	$ 118	$ 299
Deferred financing costs	276	241
Restricted cash	154	0
Other	125	177
Total prepaid expenses and other current assets	$ 673	$ 717