SEGMENT REPORTING (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2020 USD ($)	Jul. 31, 2019 USD ($)	Jul. 31, 2020 USD ($) segment	Jul. 31, 2019 USD ($)	Jan. 31, 2020 USD ($)
Segment Reporting Information
Operating segment | segment			1
Revenues	$ 87,492	$ 63,059	$ 147,640	$ 112,603
Cost of revenues	71,862	60,094	128,001	130,664
Gross (loss) profit	15,630	2,965	19,639	(18,061)
Selling, general and administrative expenses	9,085	10,038	19,429	19,626
Impairment loss				2,072
(Loss) income from operations	6,545	(7,073)	210	(39,759)
Other income, net	451	1,642	1,539	3,894
(Loss) income before income taxes	6,996	(5,431)	1,749	(35,865)
Income tax benefit	(1,397)	6,411	3,057	6,932
Net income (loss)	5,599	980	4,806	(28,933)
Amortization of intangibles	226	293	451	592
Depreciation	921	882	1,858	1,711
Property, plant and equipment additions	449	1,058	1,133	3,043
Current assets	503,456	353,137	503,456	353,137	$ 421,755
Current liabilities	233,435	58,714	233,435	58,714	144,034
Goodwill	27,943	30,766	27,943	30,766	27,943
Total assets	561,107	419,724	561,107	419,724	$ 487,540
Other
Segment Reporting Information
Selling, general and administrative expenses	2,034	1,760	3,839	3,330
(Loss) income from operations	(2,034)	(1,760)	(3,839)	(3,330)
Other income, net	13	152	77	304
(Loss) income before income taxes	(2,021)	(1,608)	(3,762)	(3,026)
Depreciation	1	2	2	3
Property, plant and equipment additions				11
Current assets	121,905	64,000	121,905	64,000
Current liabilities	699	618	699	618
Total assets	122,211	71,339	122,211	71,339
Intercompany Eliminations
Segment Reporting Information
Revenues	1,100	900	1,700	1,400
Power Services
Segment Reporting Information
Revenues	69,039	27,890	117,651	48,093
Cost of revenues	55,610	28,906	101,320	73,432
Gross (loss) profit	13,429	(1,016)	16,331	(25,339)
Selling, general and administrative expenses	4,868	5,659	10,796	11,305
Impairment loss				2,072
(Loss) income from operations	8,561	(6,675)	5,535	(38,716)
Other income, net	438	1,490	1,462	3,590
(Loss) income before income taxes	8,999	(5,185)	6,997	(35,126)
Amortization of intangibles	60	83	120	170
Depreciation	174	173	344	341
Property, plant and equipment additions	313	812	693	1,874
Current assets	356,383	252,367	356,383	252,367
Current liabilities	219,315	45,061	219,315	45,061
Goodwill	18,476	18,476	18,476	18,476
Total assets	389,380	281,535	389,380	281,535
Industrial Services
Segment Reporting Information
Revenues	16,689	33,230	26,433	60,299
Cost of revenues	14,896	29,528	23,878	53,799
Gross (loss) profit	1,793	3,702	2,555	6,500
Selling, general and administrative expenses	1,713	2,080	3,836	3,941
(Loss) income from operations	80	1,622	(1,281)	2,559
(Loss) income before income taxes	80	1,622	(1,281)	2,559
Amortization of intangibles	166	165	331	331
Depreciation	646	606	1,313	1,166
Property, plant and equipment additions	94	236	304	1,051
Current assets	23,244	34,822	23,244	34,822
Current liabilities	12,568	12,258	12,568	12,258
Goodwill	9,467	12,290	9,467	12,290
Total assets	46,099	63,393	46,099	63,393
Telecom Services
Segment Reporting Information
Revenues	1,764	1,939	3,556	4,211
Cost of revenues	1,356	1,660	2,803	3,433
Gross (loss) profit	408	279	753	778
Selling, general and administrative expenses	470	539	958	1,050
(Loss) income from operations	(62)	(260)	(205)	(272)
(Loss) income before income taxes	(62)	(260)	(205)	(272)
Amortization of intangibles		45		91
Depreciation	100	101	199	201
Property, plant and equipment additions	42	10	136	107
Current assets	1,924	1,948	1,924	1,948
Current liabilities	853	777	853	777
Total assets	$ 3,417	$ 3,457	$ 3,417	$ 3,457