SEGMENT REPORTING (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2023 USD ($)	Jul. 31, 2022 USD ($)	Jul. 31, 2023 USD ($) segment	Jul. 31, 2022 USD ($)	Jan. 31, 2023 USD ($)
Segment Reporting Information
Operating segment | segment			1
Revenues	$ 141,349	$ 118,110	$ 245,024	$ 218,387
Cost of revenues	117,607	93,723	207,058	174,262
Gross profit	23,742	24,387	37,966	44,125
Selling, general and administrative expenses	10,501	10,984	21,092	21,559
Income (loss) from operations	13,241	13,403	16,874	22,566
Other income (loss), net	4,118	505	3,489	1,100
Income (loss) before income taxes	17,359	13,908	20,363	23,666
Income tax expense	4,592	9,686	5,487	11,959
Net income	12,767	4,222	14,876	11,707
Amortization of intangibles	98	233	196	399
Depreciation	488	747	1,035	1,556
Property, plant and equipment additions	386	400	1,031	638
Current assets	455,132	378,193	455,132	378,193	$ 438,702
Current liabilities	215,606	142,012	215,606	142,012	202,503
Goodwill	28,033	28,033	28,033	28,033	28,033
Total assets	505,708	423,070	505,708	423,070	$ 489,487
Other [Member]
Segment Reporting Information
Selling, general and administrative expenses	2,732	2,433	5,446	4,869
Income (loss) from operations	(2,732)	(2,433)	(5,446)	(4,869)
Other income (loss), net	514	69	(2,205)	78
Income (loss) before income taxes	(2,218)	(2,364)	(7,651)	(4,791)
Depreciation	1	1	2	2
Current assets	86,073	82,717	86,073	82,717
Current liabilities	1,488	646	1,488	646
Total assets	89,178	82,992	89,178	82,992
Power Industry Services [Member] | Operating Segments
Segment Reporting Information
Revenues	105,345	91,327	175,521	165,276
Cost of revenues	87,094	71,225	147,429	130,260
Gross profit	18,251	20,102	28,092	35,016
Selling, general and administrative expenses	5,596	6,058	11,310	11,673
Income (loss) from operations	12,655	14,044	16,782	23,343
Other income (loss), net	3,607	437	5,697	1,021
Income (loss) before income taxes	16,262	14,481	22,479	24,364
Depreciation	128	138	256	280
Property, plant and equipment additions	148	42	537	94
Current assets	319,196	258,771	319,196	258,771
Current liabilities	183,405	124,320	183,405	124,320
Goodwill	18,476	18,476	18,476	18,476
Total assets	346,192	282,783	346,192	282,783
Industrial Construction Services | Operating Segments
Segment Reporting Information
Revenues	32,756	23,022	63,063	45,523
Cost of revenues	28,076	19,551	54,638	38,231
Gross profit	4,680	3,471	8,425	7,292
Selling, general and administrative expenses	1,446	1,685	2,906	3,444
Income (loss) from operations	3,234	1,786	5,519	3,848
Income (loss) before income taxes	3,234	1,786	5,519	3,848
Amortization of intangibles	98	165	196	331
Depreciation	260	508	564	1,052
Property, plant and equipment additions	220	336	476	487
Current assets	45,590	31,960	45,590	31,960
Current liabilities	28,996	15,055	28,996	15,055
Goodwill	9,467	9,467	9,467	9,467
Total assets	63,074	49,097	63,074	49,097
Telecommunications Infrastructure Services [Member] | Operating Segments
Segment Reporting Information
Revenues	3,248	3,761	6,440	7,588
Cost of revenues	2,437	2,947	4,991	5,771
Gross profit	811	814	1,449	1,817
Selling, general and administrative expenses	727	808	1,430	1,573
Income (loss) from operations	84	6	19	244
Other income (loss), net	(3)	(1)	(3)	1
Income (loss) before income taxes	81	5	16	245
Amortization of intangibles		68		68
Depreciation	99	100	213	222
Property, plant and equipment additions	18	22	18	57
Current assets	4,273	4,745	4,273	4,745
Current liabilities	1,717	1,991	1,717	1,991
Goodwill	90	90	90	90
Total assets	$ 7,264	$ 8,198	$ 7,264	$ 8,198