Income Taxes - Tax Effects of Temporary Differences that gave Rise to Significant Portions of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands		Jan. 31, 2023	Jan. 31, 2022
Deferred Tax Assets:
Inventory		$ 2,710	$ 2,159
Honeywell Royalty Liability		3,008	2,655
State R&D Credits		1,851	1,925
Share-Based Compensation		620	593
Bad Debt		180	213
Warranty Reserve		258	198
Compensation Accrual		248	322
Net Operating Loss		135	152
ASU 842 Adjustment – Lease Liability		53	93
Unrecognized State Tax Benefits		58	64
Foreign Tax Credit		154	154
Deferred Service Contract Revenue		90	61
Section 174 Capitalization	[1]	1,175	0
Other		281	224
Deferred Tax Assets, Total		10,821	8,813
Deferred Tax Liabilities:
Accumulated Tax Depreciation in Excess of Book Depreciation		1,037	455
Intangibles		694	767
ASU 842 Adjustment – Lease Liability		50	90
Other		180	318
Deferred Tax Liabilities, Total		1,961	1,630
Subtotal		8,860	7,183
Valuation Allowance		(2,120)	(1,778)
Net Deferred Tax Assets		6,740	5,405
Deferred taxes are reflected in the consolidated balance sheet as follows:
Deferred Tax Assets		6,907	5,591
Deferred Tax Liabilities		(167)	(186)
Total Net Deferred Tax Assets		$ 6,740	$ 5,405

[1] Beginning in fiscal 2023, changes to Section 174 of the Internal Revenue Code made by the Tax Cuts and Jobs Act of 2017 no longer permit an immediate deduction for research and development expenditures in the tax year that such costs are incurred. These costs are capitalized resulting in an increase in deferred tax assets of $1.2 million.