Note 9 - Accrued Liabilities and Other Current Liabilities - Summary of Accrued Liabilities and Other Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Employee compensation expense	$ 14	$ 4,221
Terminal and Pipeline asset costs	650	2,503
Accrued legal services	5	1,060
Other accrued liabilities	363	967
Total accrued liabilities and other current liabilities	$ 1,032	$ 8,751