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INVENTORY - Carrying Value of Inventory (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 18, 2022
Jun. 30, 2023
Jun. 18, 2022
Dec. 31, 2022
Inventory Disclosure [Abstract]          
Solvents and solutions $ 11,829,000   $ 11,829,000   $ 10,792,000
Used oil and processed oil 18,991,000   18,991,000   14,904,000
Machines 7,206,000   7,206,000   6,329,000
Drums and supplies 6,543,000   6,543,000   6,476,000
Other 2,910,000   2,910,000   2,666,000
Total inventory 47,479,000   47,479,000   41,167,000
Less: machine refurbishing reserve 455,000   455,000   440,000
Total inventory - net 47,024,000   47,024,000   $ 40,727,000
Inventory write downs $ 0 $ 0 $ 0 $ 0