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Income Taxes (Details 3) (USD $)
In Thousands, unless otherwise specified
Jan. 31, 2013
Jan. 31, 2012
Deferred Tax Assets:    
Inventory $ 1,258 $ 1,515
Stock-Based Compensation 403 380
R&D Credits 231 280
Vacation Accrual 349 355
ASC 740 Liability Federal Benefit 361 336
Deferred Service Contract Revenue 106 126
Warranty Reserve 135 132
Reserve for Doubtful Accounts 117 150
Other 166 336
Total 3,126 3,610
Deferred Tax Liabilities:    
Accumulated Tax Depreciation in Excess of Book Depreciation 532 907
Currency Translation Adjustment 189 155
Lease Amortization   70
Other 63 63
Total 784 1,195
Subtotal 2,342 2,415
Valuation Allowance (231) (280)
Net Deferred Tax Assets $ 2,111 $ 2,135