Note 2 - Prepaid Expenses and Other Current Assets - Summary of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Prepaid subscriptions	$ 417	$ 85
Prepaid insurance	186	272
Prepaid marketing and sponsorships	60	60
Other	366	418
Total prepaid expenses and other current assets	$ 1,029	$ 835