QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 31, 2022	Oct. 31, 2021	Jul. 31, 2021	Apr. 30, 2021	Jan. 31, 2021	Oct. 31, 2020	Jul. 31, 2020	Apr. 30, 2020	Jan. 31, 2022	Jan. 31, 2021
Net sales									$ 118,386	$ 159,000
Cost of goods sold									67,473	79,717
Income tax expense (benefit)									4,781	8,583
Operating profit									50,913	79,283
Net income									$ 11,372	$ 35,330
Weighted average shares used in computing basic EPS									7,900,131	7,977,683
Diluted net income per share									$ 1.41	$ 4.34
Weighted average shares used in computing diluted EPS									8,053,876	8,141,189
Basic net income per share									$ 1.44	$ 4.43
EPS
Net sales	$ 26,796	$ 30,032	$ 27,466	$ 34,092	$ 36,946	$ 41,451	$ 35,021	$ 45,582
Cost of goods sold	16,289	17,262	14,609	19,313	19,060	19,688	17,606	23,363
Income tax expense (benefit)	744	1,328	1,094	1,615	1,340	3,189	377	3,677
Operating profit	1,124	4,226	4,066	6,631	9,064	12,568	9,809	12,445
Net income	$ 507	$ 2,895	$ 2,968	$ 5,002	$ 7,725	$ 9,387	$ 9,461	$ 8,757
Weighted average shares used in computing basic EPS	7,832,621	7,849,591	7,982,995	7,989,215	7,982,018	7,979,902	7,976,275	7,972,423
Diluted net income per share	$ 0.06	$ 0.36	$ 0.37	$ 0.61	$ 0.94	$ 1.16	$ 1.17	$ 1.09
Weighted average shares used in computing diluted EPS	7,992,499	7,998,965	8,141,107	8,143,805	8,182,337	8,123,848	8,079,744	8,044,849
Basic net income per share	$ 0.06	$ 0.37	$ 0.36	$ 0.63	$ 0.97	$ 1.18	$ 1.19	$ 1.10