BUSINESS COMBINATIONS (Details) - USD ($)	3 Months Ended		12 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	Jan. 31, 2018	Aug. 10, 2017
BUSINESS COMBINATIONS (Details) [Line Items]
Selling, General and Administrative Expense	$ 4,553,000	$ 5,402,000
Income Tax Expense (Benefit)	(2,703,000)	2,390,000
Net Income (Loss) Attributable to Parent	9,496,000	$ 4,544,000
Business Acquisition, Pro Forma Earnings Per Share, Basic (in Dollars per share)		$ 0.29
Business Acquisition, Pro Forma Earnings Per Share, Diluted (in Dollars per share)		$ 0.29
Business Acquisition, Pro Forma Revenue			$ 600,000
Business Acquisition, Pro Forma Net Income (Loss)			6,900,000
Payments to Acquire Businesses, Gross	12,049,000		12,049,000
Business Acquisition, Transaction Costs			$ 2,500,000
Refined Coal [Member]
BUSINESS COMBINATIONS (Details) [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent				95.35%
Income Tax Expense (Benefit)	$ (3,999,000)
Refined Coal [Member] | Pro Forma [Member]
BUSINESS COMBINATIONS (Details) [Line Items]
Costs and Expenses		$ 692,000
Selling, General and Administrative Expense		2,510,000
Income Tax Expense (Benefit)		1,217,000
Net Income (Loss) Attributable to Parent		$ 1,893,000