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AFFILIATIONS, DISCONTINUED OPERATIONS AND RELATED-PARTY TRANSACTIONS - Summarized Operating Results (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Gain (Loss) before Income Taxes: [Abstract]
Income Tax Benefits	$ 16	$ 11	$ 56	$ 34
Loss from Discontinued Operations — Net	$ (59)	$ (43)	$ (216)	$ (135)
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:	$ (16)	$ 3	$ (60)	$ (30)
Fuel Oil
Gain (Loss) before Income Taxes: [Abstract]
Loss before Income Taxes:	$ (59)	$ (57)	$ (212)	$ (139)

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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