Note 8 - Accrued Liabilities and Other Current Liabilities - Summary of Accrued Liabilities and Other Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Employee compensation expense	$ 4,358	$ 14
Terminal asset costs	926	650
Accrued legal services	70	5
Other accrued liabilities	437	363
Total accrued liabilities and other current liabilities	$ 5,791	$ 1,032