Note 7 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Jan. 31, 2017	Jan. 31, 2016
Deferred tax assets:
Property and equipment, principally due to differing depreciation methods	$ 145	$ 153
Accruals and reserves	140	145
Net research and manufacturer investment credit carryforwards	2,325	2,325
Net operating losses	13,493	13,832
AMT credit carryforwards	136	136
Stock based compensation	156	140
Other
Total gross deferred tax assets	16,395	16,731
Less: valuation allowance	(16,395)	(16,731)
Net deferred tax assets	$ 0	$ 0