Note 6 - Other Non-current Assets (Tables)

6 Months Ended

Jun. 30, 2022

Notes Tables

Schedule of Other Assets, Noncurrent [Table Text Block]

	June 30,		December 31,
	2022		2021
Permitting costs(1)	$	8,110	$	7,644
Enterprise resource planning system, net		—		354
Rio Grande Site Lease initial direct costs		16,456		13,314
Total other non-current assets, net	$	24,566	$	21,312