Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock	Preferred Stock	Additional Paid-In Capital	Non- controlling Interests	Accumulated Deficit	Total
Balances at Dec. 31, 2017	$ 60		$ 58,813	$ 1,841	$ (44,218)	$ 16,496
Balances, shares at Dec. 31, 2017	6,006
Stock based compensation			1,133			1,133
Stock based compensation, shares
Vested restricted stock	$ 1		(1)
Vested restricted stock, shares	60
Vested performance units	$ 1		(1)
Vested performance units, shares	108
Restricted stock and performance units exchanged for tax withholding			(197)			(197)
Restricted stock and performance units exchanged for tax withholding, shares	(46)
Preferred share issuance		$ 1	4,999			5,000
Preferred share issuance, shares		50
Beneficial conversion feature			1,125		(1,125)
California Warrant exercise - share issuance	$ 15		8,312	16,465		24,792
California Warrant exercise - share issuance, shares	1,528
Majority control of Carbon California (Note 4)			10,429			10,429
Units issued with 2018 Subordinated Notes, related party (Note 7)				489		489
Non-controlling interest distributions (contributions), net				5,114		5,114
Net income (loss)				4,375	8,404	12,779
Balances at Dec. 31, 2018	$ 77	$ 1	84,612	28,284	(36,939)	76,035
Balances, shares at Dec. 31, 2018	7,656	50
Stock based compensation			1,448			1,448
Stock based compensation, shares
Vested restricted stock	$ 1		(1)
Vested restricted stock, shares	106
Vested performance units	$ 1		(1)
Vested performance units, shares	95
Restricted stock and performance units exchanged for tax withholding	$ (1)		(224)			(225)
Restricted stock and performance units exchanged for tax withholding, shares	(61)
Non-controlling interest distributions (contributions), net				(36)		(36)
Net income (loss)				(2,098)	1,097	(1,001)
Balances at Dec. 31, 2019	$ 78	$ 1	$ 85,834	$ 26,150	$ (35,842)	$ 76,221
Balances, shares at Dec. 31, 2019	7,796	50