Note 7 - Other Non-current Assets (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

Schedule of Other Assets, Noncurrent [Table Text Block]

Other non-current assets consisted of the following (in thousands):	December 31,		December 31,
	2019		2018
Permitting costs (1)	$	2,621	$	—
Enterprise resource planning system		3,181		—
Rio Grande Site Lease initial direct costs		946
Total other non-current assets	$	6,748	$	—