Note 6 - Other Non-current Assets - Schedule of Other Non-current Assets (Details) - USD ($) $ in Thousands		Sep. 30, 2019	Dec. 31, 2018
Permitting costs (1)	[1]	$ 1,151
Enterprise resource planning system		1,920
Total other non-current assets		$ 3,071

[1] Permitting costs primarily represent costs incurred in connection with our permit application to the United States Army Corps of Engineers and the cost of wetlands and habitat mitigation measures that may be caused by the construction of the Project.