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REVENUE AND COST OF SALES (Details 1) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Production costs $ 0 $ 3,525,000 $ 0 $ 9,179,000
Stand-by and ramp-up costs 554,000 0 800,000 0
Depreciation and depletion 463,000 528,000 926,000 1,147,000
Cost of sales $ 1,017,000 $ 4,053,000 $ 1,726,000 $ 10,326,000