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REVENUE AND COST OF SALES (Details 1) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Production costs $ 4,905,000 $ 11,443,000 $ 27,949,000
Stand-by costs 800,000 2,394,000 0
Inventory net realizable adjustment 0 0 387
Depreciation and depletion 1,976,000 1,995,000 3,680,000
Cost of sales $ 7,681,000 $ 15,832,000 $ 32,016,000