SEGMENT REPORTING (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2022 USD ($)	Jul. 31, 2021 USD ($)	Jul. 31, 2022 USD ($) segment	Jul. 31, 2021 USD ($)	Jan. 31, 2022 USD ($)
Segment Reporting Information
Operating segment | segment			1
Revenues	$ 118,110	$ 133,008	$ 218,387	$ 259,349
Cost of revenues	93,723	105,356	174,262	207,983
Gross profit	24,387	27,652	44,125	51,366
Selling, general and administrative expenses	10,984	10,331	21,559	20,223
Income (loss) from operations	13,403	17,321	22,566	31,143
Other income, (expense), net	505	(260)	1,100	452
Income (loss) before income taxes	13,908	17,061	23,666	31,595
Income tax expense	(9,686)	(4,191)	(11,959)	(7,959)
Net income	4,222	12,870	11,707	23,636
Amortization of intangibles	233	225	399	453
Depreciation	747	859	1,556	1,741
Property, plant and equipment additions	400	167	638	1,011
Current assets	378,193	597,656	378,193	597,656	$ 507,284
Current liabilities	142,012	307,347	142,012	307,347	223,027
Goodwill	28,033	27,943	28,033	27,943	28,033
Total assets	423,070	651,989	423,070	651,989	$ 553,585
Other [Member]
Segment Reporting Information
Selling, general and administrative expenses	2,433	2,119	4,869	4,188
Income (loss) from operations	(2,433)	(2,119)	(4,869)	(4,188)
Other income, (expense), net	69	2	78	4
Income (loss) before income taxes	(2,364)	(2,117)	(4,791)	(4,184)
Depreciation	1	1	2	2
Property, plant and equipment additions		2		3
Current assets	82,717	174,823	82,717	174,823
Current liabilities	646	683	646	683
Total assets	82,992	175,158	82,992	175,158
Intercompany Eliminations
Segment Reporting Information
Revenues		1,200		3,200
Power Industry Services [Member]
Segment Reporting Information
Revenues	91,327	99,004	165,276	196,176
Cost of revenues	71,225	78,496	130,260	157,165
Gross profit	20,102	20,508	35,016	39,011
Selling, general and administrative expenses	6,058	5,751	11,673	11,206
Income (loss) from operations	14,044	14,757	23,343	27,805
Other income, (expense), net	437	(262)	1,021	448
Income (loss) before income taxes	14,481	14,495	24,364	28,253
Amortization of intangibles		61		122
Depreciation	138	153	280	319
Property, plant and equipment additions	42	35	94	637
Current assets	258,771	389,998	258,771	389,998
Current liabilities	124,320	293,002	124,320	293,002
Goodwill	18,476	18,476	18,476	18,476
Total assets	282,783	422,902	282,783	422,902
Industrial Services
Segment Reporting Information
Revenues	23,022	30,153	45,523	56,811
Cost of revenues	19,551	23,847	38,231	45,816
Gross profit	3,471	6,306	7,292	10,995
Selling, general and administrative expenses	1,685	1,977	3,444	3,859
Income (loss) from operations	1,786	4,329	3,848	7,136
Income (loss) before income taxes	1,786	4,329	3,848	7,136
Amortization of intangibles	165	164	331	331
Depreciation	508	593	1,052	1,200
Property, plant and equipment additions	336	7	487	16
Current assets	31,960	29,084	31,960	29,084
Current liabilities	15,055	12,099	15,055	12,099
Goodwill	9,467	9,467	9,467	9,467
Total assets	49,097	48,655	49,097	48,655
Telecommunications Infrastructure Services [Member]
Segment Reporting Information
Revenues	3,761	3,851	7,588	6,362
Cost of revenues	2,947	3,013	5,771	5,002
Gross profit	814	838	1,817	1,360
Selling, general and administrative expenses	808	484	1,573	970
Income (loss) from operations	6	354	244	390
Other income, (expense), net	(1)		1
Income (loss) before income taxes	5	354	245	390
Amortization of intangibles	68		68
Depreciation	100	112	222	220
Property, plant and equipment additions	22	123	57	355
Current assets	4,745	3,751	4,745	3,751
Current liabilities	1,991	1,563	1,991	1,563
Goodwill	90		90
Total assets	$ 8,198	$ 5,274	$ 8,198	$ 5,274