Note 2 - Prepaid Expenses and Other Current Assets - Summary of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Prepaid subscriptions	$ 238	$ 161
Prepaid insurance	162	292
Prepaid marketing and sponsorships	194	25
Other	485	381
Total prepaid expenses and other current assets	$ 1,079	$ 859