Note 7 - Other Non-current Assets (Tables)

6 Months Ended

Jun. 30, 2020

Notes Tables

Schedule of Other Assets, Noncurrent [Table Text Block]

	June 30,		December 31,
	2020		2019
Permitting costs(1)	$	7,362	$	2,621
Enterprise resource planning system, net		2,512		3,181
Rio Grande Site Lease initial direct costs		4,043		946
Total other non-current assets, net	$	13,917	$	6,748