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, 2016	Jan. 31, 2015
Deferred Tax Assets:
Inventory	$ 1,948	$ 1,666
Share-Based Compensation	830	572
State R&D Credits	583	371
Compensation Accrual	346	417
ASC 740 Liability Federal Benefit	237	304
Deferred Service Contract Revenue	200	235
Warranty Reserve	149	140
Reserve for Doubtful Accounts	140	116
Foreign Tax Credit	426	356
Currency Translation Adjustment	36
Other	207	298
Deferred Tax Assets, Total	5,102	4,475
Deferred Tax Liabilities:
Accumulated Tax Depreciation in Excess of Book Depreciation	1,355	766
Deferred Gain on Asset Held for Sale	76	785
Currency Translation Adjustment		36
Other	117	87
Deferred Tax Liabilities, Total	1,548	1,674
Subtotal	3,554	2,801
Valuation Allowance	(583)	(255)
Net Deferred Tax Assets	$ 2,971	$ 2,546