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Basis of Presentation, Business Description and Summary of Significant Accounting Policies (Details Textual) $ in Thousands | 12 Months Ended |
--- | --- | ---
May 31, 2018 USD ($) segment unit | May 31, 2017 USD ($)
Business Acquisition [Line Items] |  |
Maturity period | less than three months |
Marketable securities, at fair value | $ | $ 1,317 | $ 1,215
Number of operating segments | segment | 1 |
Number of reporting units | unit | 1 |
Restocking charge percentage | 20.00% |
Employee Stock Option |  |
Business Acquisition [Line Items] |  |
Period of recognition for costs not yet recognized | 4 years |
Restricted Stock |  |
Business Acquisition [Line Items] |  |
Period of recognition for costs not yet recognized | 3 years |
Minimum |  |
Business Acquisition [Line Items] |  |
Accounts receivables period due | 30 days |
Estimates useful life of intangible assets other than goodwill | 2 years |
Undamaged product expiration date | 12 months |
Maximum |  |
Business Acquisition [Line Items] |  |
Accounts receivables period due | 90 days |
Estimates useful life of intangible assets other than goodwill | 18 years |
Building and building improvements |  |
Business Acquisition [Line Items] |  |
Useful life | 39 years |
Machinery and equipment | Minimum |  |
Business Acquisition [Line Items] |  |
Useful life | 5 years |
Machinery and equipment | Maximum |  |
Business Acquisition [Line Items] |  |
Useful life | 8 years |
Computer software and equipment | Minimum |  |
Business Acquisition [Line Items] |  |
Useful life | 3 years |
Computer software and equipment | Maximum |  |
Business Acquisition [Line Items] |  |
Useful life | 5 years |

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