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AFFILIATIONS, DISCONTINUED OPERATIONS AND RELATED-PARTY TRANSACTIONS - Summarized Operating Results (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Gain (Loss) before Income Taxes: [Abstract]    
Income Tax Benefits $ 16 $ 16
Loss from Discontinued Operations — Net $ (59) $ (62)
Earnings Per Common Share from    
Basic and Diluted (in dollars per share) $ 0 $ 0
Sand Mining    
Gain (Loss) before Income Taxes: [Abstract]    
Loss before Income Taxes: $ (19) $ (21)
Fuel Oil    
Gain (Loss) before Income Taxes: [Abstract]    
Loss before Income Taxes: $ (56) $ (57)