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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, 2020
Jan. 31, 2019
Deferred Tax Assets:    
Inventory $ 2,094 $ 1,800
Honeywell Royalty Liability 2,583 3,146
State R&D Credits 1,496 1,305
Share-Based Compensation 582 493
Compensation Accrual 159 155
Warranty Reserve 205 201
Unrecognized State Tax Benefits 116 133
Deferred Service Contract Revenue 111 91
Bad Debt 165 101
Net Operating Loss 443 505
Foreign Tax Credit 113  
Other 295 142
Deferred Tax Assets, Total 8,362 8,072
Deferred Tax Liabilities:    
Intangibles 776 2,660
Accumulated Tax Depreciation in Excess of Book Depreciation 1,002 982
Other 188 238
Deferred Tax Liabilities, Total 1,966 3,880
Subtotal 6,396 4,192
Valuation Allowance (1,752) (1,304)
Net Deferred Tax Assets $ 4,644 $ 2,888