Note 6 - Other Non-current Assets (Tables)

3 Months Ended

Mar. 31, 2023

Notes Tables

Schedule of Other Assets, Noncurrent [Table Text Block]

	March 31,		December 31,
	2023		2022
Permitting costs(1)	$	8,680	$	8,540
Rio Grande Site Lease initial direct costs		21,243		19,647
Deposits and other		185		185
Total other non-current assets, net	$	30,108	$	28,372