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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, 2019
Jan. 31, 2018
Deferred Tax Assets:    
Inventory $ 1,800 $ 1,648
Honeywell Royalty Liability 3,146 3,382
State R&D Credits 1,305 1,161
Share-Based Compensation 493 399
Compensation Accrual 155 194
Warranty Reserve 201 139
Unrecognized State Tax Benefits 133 138
Deferred Service Contract Revenue 91 84
Bad Debt 101  
Net Operating Loss 505  
Other 142 176
Deferred Tax Assets, Total 8,072 7,321
Deferred Tax Liabilities:    
Intangibles 2,660 3,679
Accumulated Tax Depreciation in Excess of Book Depreciation 982 1,028
Other 238 322
Deferred Tax Liabilities, Total 3,880 5,029
Subtotal 4,192 2,292
Valuation Allowance (1,304) (1,161)
Net Deferred Tax Assets $ 2,888 $ 1,131