Note 3 - Prepaid Expenses and Other Current Assets - Summary of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Prepaid subscriptions	$ 29	$ 161
Prepaid insurance	314	292
Prepaid marketing and sponsorships	60	25
Other	267	381
Total prepaid expenses and other current assets	$ 670	$ 859