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Related-Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019	Jan. 31, 2020
Related-Party Transactions (Details) [Line Items]
Accounts Payable, Related Parties, Current	$ 578		$ 578		$ 676
One Earth Energy And Nu Gen Energy [Member]
Related-Party Transactions (Details) [Line Items]
Costs and Expenses, Related Party	4,900	$ 43,500	17,200	$ 90,200
Accounts Payable, Related Parties, Current	600		600		700
Refined Coal [Member]
Related-Party Transactions (Details) [Line Items]
Payments for Commissions	200	$ 300	100	$ 300
Accrued Liabilities for Commissions, Expense and Taxes	$ 200		$ 200		$ 500

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Amount for accounts payable to related parties. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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The carrying amount for commissions, taxes and other expenses that were incurred but unpaid as of the balance sheet date.

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Costs of sales and operating expenses for the period incurred from transactions with related parties.

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The amount of cash paid for commissions during the current period.

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-Section 45
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