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Note 6 - Other Non-current Assets (Tables)

9 Months Ended

Sep. 30, 2021

Notes Tables

Schedule of Other Assets, Noncurrent [Table Text Block]

		*September 30,*				*December 31,*
		*2021*				*2020*
Permitting costs⁽¹⁾		$	7,409			$	7,385
Enterprise resource planning system, net			743				1,805
Rio Grande Site Lease initial direct costs			11,751				7,109
Total other non-current assets, net		$	19,903			$	16,299