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Note 16 - Stock-based Compensation Plans - Total Estimated Stock-based Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jan. 31, 2017 | Jan. 31, 2016 | Jan. 31, 2015
Stock-based compensation expense | $ 2,022 | $ 1,577 | $ 1,543
Cost of Sales [Member] |  |  |
Stock-based compensation expense | 40 | 24 | 45
Selling and Marketing Expense [Member] |  |  |
Stock-based compensation expense | 81 | 41 | 70
Research and Development Expense [Member] |  |  |
Stock-based compensation expense | 14 |  | 2
General and Administrative Expense [Member] |  |  |
Stock-based compensation expense | $ 1,887 | $ 1,512 | $ 1,426

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