ASSETS HELD FOR SALE AND DISCONTINUED OPERATIONS - loss from discontinued operations (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Cash flow impact of discontinued operations:
Cash flows used in operating activities from discontinued operations	$ 50
Ikonics Inc [Member] \| Discontinued Operations, Held-for-sale [Member]
ASSETS HELD FOR SALE AND DISCONTINUED OPERATIONS
Net sales	4,230
Cost of goods sold	3,223
Gross profit	1,007
Selling, general and administrative expenses	1,264
Research and development expenses	137
Impairment on re-measurement or classification as held for sale	3,922
Loss from discontinued operations before other income	(4,316)
Other income	3
Loss from operations before income tax	(4,313)
Income tax (expense) benefit	1
Net loss from discontinued operations	(4,312)
Cash flow impact of discontinued operations:
Cash flows used in operating activities from discontinued operations	$ 50,000,000	$ 0

Amount of cash inflow (outflow) of operating activities of discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal.

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