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AFFILIATIONS, DISCONTINUED OPERATIONS AND RELATED-PARTY TRANSACTIONS - Summarized Operating Results (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Gain (Loss) before Income Taxes: [Abstract]
Income Tax Benefits	$ 16	$ 24	$ 32	$ 40
Loss from Discontinued Operations — Net	$ (61)	$ (95)	$ (120)	$ (157)
Earnings Per Common Share from
Basic and Diluted (in dollars per share)	$ 0	$ 0	$ 0	$ 0
Sand Mining
Gain (Loss) before Income Taxes: [Abstract]
Loss before Income Taxes:	$ (17)	$ (23)	$ (36)	$ (44)
Fuel Oil
Gain (Loss) before Income Taxes: [Abstract]
Loss before Income Taxes:	$ (60)	$ (96)	$ (116)	$ (153)

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

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