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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, unless otherwise specified
Jan. 31, 2014
Jan. 31, 2013
Deferred Tax Assets:    
Inventory $ 1,792 $ 1,258
Stock-Based Compensation 535 403
State R&D Credits 258 231
Compensation Accrual 493 349
ASC 740 Liability Federal Benefit 290 361
Deferred Service Contract Revenue 181 106
Warranty Reserve 137 135
Reserve for Doubtful Accounts 127 117
Foreign Tax Credit 213  
Other 119 166
Deferred Tax Assets, Total 4,145 3,126
Deferred Tax Liabilities:    
Accumulated Tax Depreciation in Excess of Book Depreciation 830 532
Deferred Gain on Asset Held for Sale 897  
Currency Translation Adjustment 173 189
Other 78 63
Deferred Tax Liabilities, Total 1,978 784
Subtotal 2,167 2,342
Valuation Allowance (258) (231)
Net Deferred Tax Assets $ 1,909 $ 2,111