Note 8 - Other Non-current Assets (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

Schedule of Other Assets, Noncurrent [Table Text Block]

Other non-current assets consisted of the following (in thousands):	December 31,		December 31,
	2020		2019
Permitting costs(1)	$	7,385	$	2,637
Enterprise resource planning system, net		1,805		3,165
Rio Grande Site Lease initial direct costs		7,109		946
Total other non-current assets, net	$	16,299	$	6,748