SEGMENT REPORTING (Details) $ in Thousands	3 Months Ended
	Apr. 30, 2021 USD ($) segment	Apr. 30, 2020 USD ($)	Jan. 31, 2021 USD ($)
Segment Reporting Information
Operating segment | segment	1
Revenues	$ 126,341	$ 60,148
Cost of revenues	102,627	56,139
Gross (loss) profit	23,714	4,009
Selling, general and administrative expenses	9,892	10,344
Income (loss) from operations	13,822	(6,335)
Other income, net	712	1,088
Income (loss) before income taxes	14,534	(5,247)
Income tax expense	(3,768)	4,454
Net income (loss)	10,766	(793)
Amortization of intangibles	228	225
Depreciation	882	937
Property, plant and equipment additions	844	684
Current assets	559,031	455,736	$ 546,220
Current liabilities	283,065	173,106	276,087
Goodwill	27,943	27,943	27,943
Total assets	617,972	512,964	$ 602,630
Other
Segment Reporting Information
Selling, general and administrative expenses	2,069	1,805
Income (loss) from operations	(2,069)	(1,805)
Other income, net	2	64
Income (loss) before income taxes	(2,067)	(1,741)
Depreciation	1	1
Property, plant and equipment additions	1
Current assets	157,349	113,633
Current liabilities	1,586	455
Total assets	157,716	113,963
Intercompany Eliminations
Segment Reporting Information
Revenues	2,000	600
Power Services
Segment Reporting Information
Revenues	97,172	48,612
Cost of revenues	78,669	45,710
Gross (loss) profit	18,503	2,902
Selling, general and administrative expenses	5,455	5,928
Income (loss) from operations	13,048	(3,026)
Other income, net	710	1,024
Income (loss) before income taxes	13,758	(2,002)
Amortization of intangibles	61	60
Depreciation	166	170
Property, plant and equipment additions	602	380
Current assets	371,827	316,753
Current liabilities	265,471	163,674
Goodwill	18,476	18,476
Total assets	408,442	348,577
Industrial Services
Segment Reporting Information
Revenues	26,658	9,744
Cost of revenues	21,969	8,982
Gross (loss) profit	4,689	762
Selling, general and administrative expenses	1,882	2,123
Income (loss) from operations	2,807	(1,361)
Income (loss) before income taxes	2,807	(1,361)
Amortization of intangibles	167	165
Depreciation	607	667
Property, plant and equipment additions	9	210
Current assets	27,422	22,916
Current liabilities	14,796	8,184
Goodwill	9,467	9,467
Total assets	47,840	46,411
Telecom Services
Segment Reporting Information
Revenues	2,511	1,792
Cost of revenues	1,989	1,447
Gross (loss) profit	522	345
Selling, general and administrative expenses	486	488
Income (loss) from operations	36	(143)
Income (loss) before income taxes	36	(143)
Depreciation	108	99
Property, plant and equipment additions	232	94
Current assets	2,433	2,434
Current liabilities	1,212	793
Total assets	$ 3,974	$ 4,013