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RELATED PARTIES (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jan. 31, 2019 | Jan. 31, 2018 | Jan. 31, 2017
RELATED PARTIES (Details) [Line Items] |  |  |
Accounts Payable, Related Parties, Current | $ 1,900 | $ 900 |
Proceeds from Contributions from Affiliates | 524 | 918 |
Refined Coal [Member] |  |  |
RELATED PARTIES (Details) [Line Items] |  |  |
Costs and Expenses, Related Party | 800 |  |
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party |  | 1,800 |
Accrued Liabilities for Commissions, Expense and Taxes | 1,600 | 1,500 |
Proceeds from Contributions from Affiliates | 500 | 900 |
One Earth Energy And Nu Gen Energy [Member] |  |  |
RELATED PARTIES (Details) [Line Items] |  |  |
Costs and Expenses, Related Party | $ 176,800 | $ 154,500 | $ 148,500

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