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AFFILIATIONS, DISCONTINUED OPERATIONS AND RELATED-PARTY TRANSACTIONS - OPERATING RESULTS OF DISCONTINUED OPERATIONS (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Loss before Income Taxes:
Income Tax Benefits	$ 62	$ 173	$ 133
Loss from Discontinued Operations - (Net of tax benefit)	$ (240)	$ (86)	$ (251)
Earnings Per Common Share from Discontinued Operations - Net
Basic and Diluted (in USD per share)	$ 0.00	$ 0.00	$ 0.00
Sand Mining
Loss before Income Taxes:
Loss before Income Taxes	$ (118)	$ (84)	$ (205)
Fuel Oil
Loss before Income Taxes:
Loss before Income Taxes	$ (184)	$ (175)	$ (179)

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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