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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Gain (Loss) before Income Taxes: [Abstract]        
Income Tax Benefits $ 15 $ 16 $ 47 $ 56
Loss from Discontinued Operations — Net $ (58) $ (59) $ (178) $ (216)
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: $ 3 $ (16) $ (32) $ (60)
Fuel Oil        
Gain (Loss) before Income Taxes: [Abstract]        
Loss before Income Taxes: $ (76) $ (59) $ (193) $ (212)