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Stock-Based Compensation and Stockholders' Rights (Restricted Stock Units) (Details) - Restricted Stock Units (RSUs) [Member] - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2017 | Apr. 30, 2016 | Jan. 31, 2017
Summary of restricted stock and stock unit awards |  |  |
Expense | $ 167 | $ 124 |
Unrecognized compensation cost | $ 695 |  |
2011 Plan [Member] |  |  |
Summary of restricted stock and stock unit awards |  |  |
Units granted (units) |  |  | 87,284
2011 Plan [Member] | June 21, 2016 [Member] | 1 year [Member] |  |  |
Summary of restricted stock and stock unit awards |  |  |
Units granted (units) | 51,284 |  |
Terms of vesting | 1 year |  |
Expense | $ 50 | 0 |
Unrecognized compensation cost | $ 16 |  |
2011 Plan [Member] | June 21, 2016 [Member] | 3 years [Member] |  |  |
Summary of restricted stock and stock unit awards |  |  |
Units granted (units) | 36,000 |  |
Terms of vesting | 3 years |  |
Expense | $ 12 | 0 |
Unrecognized compensation cost | $ 96 |  |
2011 Plan [Member] | June 22, 2015 [Member] | 1 year [Member] |  |  |
Summary of restricted stock and stock unit awards |  |  |
Units granted (units) | 27,174 |  |
Terms of vesting | 1 year |  |
Expense | $ 0 | 19 |
Unrecognized compensation cost | $ 0 |  |
2011 Plan [Member] | June 22, 2015 [Member] | 4 years [Member] |  |  |
Summary of restricted stock and stock unit awards |  |  |
Units granted (units) | 48,000 |  |
Terms of vesting | 4 years |  |
Expense | $ 8 | 8 |
Unrecognized compensation cost | $ 70 |  |
2011 Plan [Member] | June 24, 2014 [Member] | 1 year [Member] |  |  |
Summary of restricted stock and stock unit awards |  |  |
Units granted (units) | 28,626 |  |
Terms of vesting | 1 year |  |
Expense | $ 0 | 0 |
Unrecognized compensation cost | $ 0 |  |
2011 Plan [Member] | June 24, 2014 [Member] | 5 years [Member] |  |  |
Summary of restricted stock and stock unit awards |  |  |
Units granted (units) | 490,000 |  |
Terms of vesting | 5 years |  |
Expense | $ 60 | 60 |
Unrecognized compensation cost | $ 500 |  |
2011 Plan [Member] | June 19, 2012 [Member] | 5 years [Member] |  |  |
Summary of restricted stock and stock unit awards |  |  |
Units granted (units) | 520,000 |  |
Terms of vesting | 5 years |  |
Expense | $ 37 | $ 37 |
Unrecognized compensation cost | $ 13 |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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