Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Cash flow from operating activities:
Net loss	$ (3,326)	$ (3,227)	$ (1,627)	$ (1,913)	$ (10,212)	$ (5,700)
Loss from discontinued operations	0		0		216	0
Loss from continuing operations	(3,326)		(1,627)		(9,996)	(5,700)
Adjustments to reconcile net loss from continuing operations to net cash used in operating activities:
Depreciation					1,332	499
Amortization					39	45
Stock and share-based compensation					925	650
Settlement with sellers of Golden Ridge					(849)	0
Other					166	75
Changes in operating assets and liabilities:
Accounts receivable					(215)	(236)
Inventories					388	42
Accounts payable and accrued expenses					(43)	(56)
Commodities payable					(1,896)	0
Other					(308)	(17)
Net cash used in operating activities					(10,457)	(4,698)
Cash flows from investing activities:
Acquisition of MGI					(3,767)	0
Purchases of property and equipment					(3,513)	(2,384)
Disbursements of notes receivable					0	(400)
Net cash used in investing activities - continuing operations					(7,280)	(2,784)
Net cash used in investing activities - discontinued operations					(475)	0
Cash flows from financing activities:
Proceeds from issuance of common stock and pre-funded warrant, net of issuance costs					11,593	0
Proceeds from common stock warrant exercises					1,990	11,003
Proceeds from common stock option exercises					156	27
Proceeds from margin loan					1,225	0
Payments of debt and finance lease liabilities					(331)	(2)
Net cash provided by financing activities					14,633	11,028
Net change in cash and cash equivalents and restricted cash					(3,579)	3,546
Cash and cash equivalents and restricted cash, beginning of period
Cash and cash equivalents		7,044		6,203	7,044	6,203	$ 6,203
Restricted cash		225		775	225	775	775
Cash and cash equivalents and restricted cash, beginning of period		$ 7,269		$ 6,978	7,269	6,978	6,978
Cash and cash equivalents and restricted cash, end of period
Cash and cash equivalents	3,690		10,299		3,690	10,299	7,044
Restricted cash	0		225		0	225	225
Cash and cash equivalents and restricted cash, end of period	$ 3,690		$ 10,524		3,690	10,524	$ 7,269
Supplemental disclosures:
Cash paid for interest					40	3
Cash paid for income taxes					$ 0	$ 0