INCOME TAXES - Income Tax Expense Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2024	Jan. 31, 2023	Jan. 31, 2022
INCOME TAXES
Federal corporate income tax rate (as percent)	21.00%	21.00%	21.00%
Computed expected income tax expense	$ 10,276	$ 9,660	$ 9,883
Unrecognized tax loss benefit	3,858
Foreign tax rate differential	(2,294)	(441)	(352)
State income taxes, net of federal tax effect	1,688	860	614
Excess executive compensation	1,040	1,397	1,296
Adjustment to valuation for foreign NOLs	2,083	(2,574)
Net benefit related to Solar Tax Credit investments	(646)
Meals and entertainment expense	626	83	58
Research and development credits adjustment		6,181
Recognition of research and development credit benefits (see discussion below)		(3,430)
Other permanent differences and adjustments, net	(56)	(440)	(143)
Income tax expense	$ 16,575	$ 11,296	$ 11,356