Note 7 - Accrued Liabilities and Other Current Liabilities - Summary of Accrued Liabilities and Other Current Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Employee compensation expense	$ 3,725	$ 14
Terminal costs	996	650
Accrued legal services	42	5
Other accrued liabilities	543	363
Total accrued liabilities and other current liabilities	$ 5,306	$ 1,032