SEGMENT REPORTING (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2020 USD ($)	Oct. 31, 2019 USD ($)	Oct. 31, 2020 USD ($) segment	Oct. 31, 2019 USD ($)	Jan. 31, 2020 USD ($)
Segment Reporting Information
Operating segment | segment			1
Revenues	$ 127,331	$ 58,406	$ 274,971	$ 171,009
Cost of revenues	106,988	52,414	234,989	183,078
Gross (loss) profit	20,343	5,992	39,982	(12,069)
Selling, general and administrative expenses	9,398	12,135	28,827	31,761
Impairment loss				2,072
(Loss) income from operations	10,945	(6,143)	11,155	(45,902)
Other income, net	175	3,578	1,714	7,472
(Loss) income before income taxes	11,120	(2,565)	12,869	(38,430)
Income tax (expense) benefit (Note 10)	(1,666)	(1,996)	1,391	4,936
Net income (loss)	9,454	(4,561)	14,260	(33,494)
Amortization of intangibles	226	272	677	864
Depreciation	940	899	2,798	2,610
Property, plant and equipment additions	279	3,265	1,412	6,308
Current assets	538,820	405,900	538,820	405,900	$ 421,755
Current liabilities	261,030	118,957	261,030	118,957	144,034
Goodwill	27,943	30,766	27,943	30,766	27,943
Total assets	595,500	472,717	595,500	472,717	$ 487,540
Other
Segment Reporting Information
Selling, general and administrative expenses	1,985	1,960	5,824	5,290
(Loss) income from operations	(1,985)	(1,960)	(5,824)	(5,290)
Other income, net	3	131	80	435
(Loss) income before income taxes	(1,982)	(1,829)	(5,744)	(4,855)
Depreciation	2	1	4	4
Property, plant and equipment additions				11
Current assets	118,758	82,048	118,758	82,048
Current liabilities	751	943	751	943
Total assets	119,045	87,998	119,045	87,998
Intercompany Eliminations
Segment Reporting Information
Revenues	500	1,100	1,400	2,500
Power Services
Segment Reporting Information
Revenues	109,712	35,848	227,363	83,941
Cost of revenues	91,263	31,327	192,583	104,759
Gross (loss) profit	18,449	4,521	34,780	(20,818)
Selling, general and administrative expenses	5,096	7,672	15,892	18,977
Impairment loss				2,072
(Loss) income from operations	13,353	(3,151)	18,888	(41,867)
Other income, net	172	3,447	1,634	7,037
(Loss) income before income taxes	13,525	296	20,522	(34,830)
Amortization of intangibles	62	61	182	231
Depreciation	178	176	522	517
Property, plant and equipment additions	164	2,659	857	4,533
Current assets	392,954	292,618	392,954	292,618
Current liabilities	245,808	108,474	245,808	108,474
Goodwill	18,476	18,476	18,476	18,476
Total assets	425,909	324,535	425,909	324,535
Industrial Services
Segment Reporting Information
Revenues	15,730	20,143	42,163	80,442
Cost of revenues	14,218	19,159	38,096	72,958
Gross (loss) profit	1,512	984	4,067	7,484
Selling, general and administrative expenses	1,828	2,018	5,664	5,959
(Loss) income from operations	(316)	(1,034)	(1,597)	1,525
(Loss) income before income taxes	(316)	(1,034)	(1,597)	1,525
Amortization of intangibles	164	166	495	497
Depreciation	654	625	1,967	1,791
Property, plant and equipment additions	34	436	338	1,487
Current assets	25,404	28,373	25,404	28,373
Current liabilities	13,762	8,744	13,762	8,744
Goodwill	9,467	12,290	9,467	12,290
Total assets	47,356	55,814	47,356	55,814
Telecom Services
Segment Reporting Information
Revenues	1,889	2,415	5,445	6,626
Cost of revenues	1,507	1,928	4,310	5,361
Gross (loss) profit	382	487	1,135	1,265
Selling, general and administrative expenses	489	485	1,447	1,535
(Loss) income from operations	(107)	2	(312)	(270)
(Loss) income before income taxes	(107)	2	(312)	(270)
Amortization of intangibles		45		136
Depreciation	106	97	305	298
Property, plant and equipment additions	81	170	217	277
Current assets	1,704	2,861	1,704	2,861
Current liabilities	709	796	709	796
Total assets	$ 3,190	$ 4,370	$ 3,190	$ 4,370