SEGMENT REPORTING (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2021 USD ($)	Oct. 31, 2020 USD ($)	Oct. 31, 2021 USD ($) segment	Oct. 31, 2020 USD ($)	Jan. 31, 2021 USD ($)
Segment Reporting Information
Operating segment | segment			1
Revenues	$ 124,451	$ 127,331	$ 383,800	$ 274,971
Cost of revenues	98,316	106,988	306,299	234,989
Gross profit	26,135	20,343	77,501	39,982
Selling, general and administrative expenses	11,590	9,398	31,813	28,827
Income (loss) from operations	14,545	10,945	45,688	11,155
Other (loss) income, net	1,117	175	1,569	1,714
Income (loss) before income taxes	15,662	11,120	47,257	12,869
Income tax (expense) benefit	(3,269)	(1,666)	(11,228)	1,391
Net income	12,393	9,454	36,029	14,260
Amortization of intangibles	227	226	680	677
Depreciation	819	940	2,560	2,798
Property, plant and equipment additions	321	279	1,123	1,412
Current assets	559,719	538,820	559,719	538,820	$ 546,220
Current liabilities	259,045	261,030	259,045	261,030	276,087
Goodwill	27,943	27,943	27,943	27,943	27,943
Total assets	613,153	595,500	613,153	595,500	$ 602,630
Other
Segment Reporting Information
Selling, general and administrative expenses	2,104	1,985	6,292	5,824
Income (loss) from operations	(2,104)	(1,985)	(6,292)	(5,824)
Other (loss) income, net	1	3	5	80
Income (loss) before income taxes	(2,103)	(1,982)	(6,287)	(5,744)
Depreciation	1	2	3	4
Property, plant and equipment additions	2		5
Current assets	157,991	118,758	157,991	118,758
Current liabilities	641	751	641	751
Total assets	158,294	119,045	158,294	119,045
Intercompany Eliminations
Segment Reporting Information
Revenues		500	2,700	1,400
Power Services
Segment Reporting Information
Revenues	99,560	109,712	295,736	227,363
Cost of revenues	76,517	91,263	233,682	192,583
Gross profit	23,043	18,449	62,054	34,780
Selling, general and administrative expenses	6,770	5,096	17,976	15,892
Income (loss) from operations	16,273	13,353	44,078	18,888
Other (loss) income, net	1,116	172	1,564	1,634
Income (loss) before income taxes	17,389	13,525	45,642	20,522
Amortization of intangibles	61	62	183	182
Depreciation	145	178	464	522
Property, plant and equipment additions	36	164	464	857
Current assets	374,370	392,954	374,370	392,954
Current liabilities	247,693	245,808	247,693	245,808
Goodwill	18,476	18,476	18,476	18,476
Total assets	406,261	425,909	406,261	425,909
Industrial Services
Segment Reporting Information
Revenues	21,402	15,730	78,213	42,163
Cost of revenues	18,703	14,218	64,519	38,096
Gross profit	2,699	1,512	13,694	4,067
Selling, general and administrative expenses	2,158	1,828	6,017	5,664
Income (loss) from operations	541	(316)	7,677	(1,597)
Income (loss) before income taxes	541	(316)	7,677	(1,597)
Amortization of intangibles	166	164	497	495
Depreciation	564	654	1,764	1,967
Property, plant and equipment additions	60	34	76	338
Current assets	24,029	25,404	24,029	25,404
Current liabilities	9,015	13,762	9,015	13,762
Goodwill	9,467	9,467	9,467	9,467
Total assets	42,833	47,356	42,833	47,356
Telecom Services
Segment Reporting Information
Revenues	3,489	1,889	9,851	5,445
Cost of revenues	3,096	1,507	8,098	4,310
Gross profit	393	382	1,753	1,135
Selling, general and administrative expenses	558	489	1,528	1,447
Income (loss) from operations	(165)	(107)	225	(312)
Income (loss) before income taxes	(165)	(107)	225	(312)
Depreciation	109	106	329	305
Property, plant and equipment additions	223	81	578	217
Current assets	3,329	1,704	3,329	1,704
Current liabilities	1,696	709	1,696	709
Total assets	$ 5,765	$ 3,190	$ 5,765	$ 3,190