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Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies (Tables) | 9 Months Ended
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Feb. 28, 2016
Notes Tables |
Schedule of Effect of Significant Unobservable Inputs for Investment [TableText Block] |
|  | At February 28, 2016 |  |  | At May 31, 2015 |
Revenue growth rates |  |  | 4% |  |  |  |  | 4% |  |
Expense growth rates |  |  | 4% |  |  |  |  | 4% |  |
Income tax rates |  |  | 15% |  |  |  |  | 15% |  |
Discount rates |  |  | 12.5% |  |  |  | 15% | to | 21% |
Schedule of Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets [Table Text Block] |
Impact on value of Windset investment as of February 28, 2016 |
10% increase in revenue growth rates |  | $ | 700 |
10% increase in expense growth rates |  | $ | (500 | )
10% increase in income tax rates |  | $ | — |
10% increase in discount rates |  | $ | (300 | )
Revenue Recognition, Multiple-deliverable Arrangements [Table Text Block] |
|  | Three months ended February 28, 2016 |  |  | Three months ended March 1, 2015 |  |  | Nine months ended February 28, 2016 |  |  | Nine months ended March 1, 2015 |
Recorded upon shipment |  | $ | 118,789 |  |  | $ | 128,502 |  |  | $ | 341,914 |  |  | $ | 344,506 |
Recorded upon acceptance in foreign port |  |  | 6,389 |  |  |  | 8,086 |  |  |  | 50,873 |  |  |  | 56,779 |
Revenue from license fees, R&D contracts and royalties/profit sharing |  |  | 787 |  |  |  | 153 |  |  |  | 3,327 |  |  |  | 788 |
Revenue from multiple element arrangements |  |  | 4,025 |  |  |  | 1,789 |  |  |  | 9,672 |  |  |  | 2,736 |
Total |  | $ | 129,990 |  |  | $ | 138,530 |  |  | $ | 405,786 |  |  | $ | 404,809 |

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- Definition Tabular disclosure of the recognition of revenue arrangements under which the entity does or will perform multiple revenue-generating activities, categorized by type of arrangement. This item includes certain revenue arrangements that include software elements. This item does not include multiple-deliverable arrangements for industries that prepare disclosures under specific requirements (for instance, construction-type and production-type contracts) otherwise provided for in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 25 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=51671369&loc=d3e50766-111635 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 25 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=51671369&loc=SL6750900-111635 + Details
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