Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Revenues:
Total revenues	$ 100,294	$ 67,363
Operating expenses:
Payroll and benefits	11,315	10,621
Legal and professional fees	6,260	5,585
General and administrative	7,060	8,228
Depreciation, amortization, depletion and accretion	7,933	8,537
Gain on change in estimate, asset retirement obligation	(2,702)	0
Impairment of long-lived assets	0	26,103
Gain on settlement	0	(1,129)
Total operating expenses	95,442	108,344
Operating income (loss)	4,852	(40,981)
Other income (expense):
Earnings from equity method investments	68,726	30,978
Gain on extinguishment of debt	3,345	0
Interest expense	(1,490)	(3,920)
Other	640	132
Total other income	71,221	27,190
Income (loss) before income tax expense	76,073	(13,791)
Income tax expense	15,672	6,511
Net income (loss)	$ 60,401	$ (20,302)
Earnings (loss) per common share:
Basic (in dollars per share)	$ 3.31	$ (1.12)
Diluted (in dollars per share)	$ 3.27	$ (1.12)
Weighted-average number of common shares outstanding:
Basic (in shares)	18,258	18,044
Diluted (in shares)	18,461	18,044
Consumables
Revenues:
Total revenues	$ 85,882	$ 53,908
Operating expenses:
Cost of revenues, exclusive of depreciation and amortization	65,576	50,962
License royalties, related party
Revenues:
Total revenues	14,368	13,440
Other
Revenues:
Total revenues	44	15
Operating expenses:
Cost of revenues, exclusive of depreciation and amortization	$ 0	$ (563)