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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, 2021
Jan. 31, 2020
Deferred Tax Assets:    
Inventory $ 2,700 $ 2,094
Honeywell Royalty Liability 2,590 2,583
State R&D Credits 1,546 1,496
Share-Based Compensation 600 582
Bad Debt 245 165
Warranty Reserve 176 205
Compensation Accrual 159 159
Net Operating Loss 154 443
ASU 842 Adjustment—Lease Liability 125  
Unrecognized State Tax Benefits 101 116
Foreign Tax Credit 83 113
Deferred Service Contract Revenue 68 111
Other 308 295
Deferred Tax Assets, Total 8,855 8,362
Deferred Tax Liabilities:    
Accumulated Tax Depreciation in Excess of Book Depreciation 752 1,002
Intangibles 399 776
ASU 842 Adjustment – Lease Liability 119 0
Other 307 188
Deferred Tax Liabilities, Total 1,577 1,966
Subtotal 7,278 6,396
Valuation Allowance (1,721) (1,752)
Net Deferred Tax Assets $ 5,557 $ 4,644