Note 7 - Accrued Liabilities and Other Current Liabilities - Summary of Accrued Liabilities and Other Current Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Employee compensation expense	$ 1,265	$ 14
Terminal costs	395	650
Accrued legal services	61	5
Other accrued liabilities	426	363
Total accrued liabilities and other current liabilities	$ 2,147	$ 1,032