Note 7 - Accrued Liabilities and Other Current Liabilities - Summary of Accrued Liabilities and Other Current Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Employee compensation expense	$ 2,604	$ 14
Terminal costs	975	650
Accrued legal services	154	5
Other accrued liabilities	544	363
Total accrued liabilities and other current liabilities	$ 4,277	$ 1,032