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Note 1 - Organization, Basis of Presentation, and Summary of Significant Accounting Policies (Tables) | 6 Months Ended
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Nov. 26, 2017
Notes Tables |
Schedule of Inventory, Current [Table Text Block] |
|  | November 26 , 2017 |  |  | May 28, 2017 |
Raw materials |  | $ | 13,229 |  |  | $ | 10,158 |
Work in progress |  |  | 4,702 |  |  |  | 3,447 |
Finished goods |  |  | 12,905 |  |  |  | 11,685 |
Total |  | $ | 30,836 |  |  | $ | 25,290 |
Comprehensive Income (Loss) [Table Text Block] |
|  | Unrealized Gains on Cash Flow Hedge |
Accumulated OCI, net, as of May 28, 2017 |  | $ | 432 |
Other comprehensive income before reclassifications, net of tax effect |  |  | 136 |
Amounts reclassified from OCI |  |  | — |
Accumulated OCI, net, as of November 26, 2017 |  | $ | 568 |
Schedule of Effect of Significant Unobservable Inputs for Investment [Table Text Block] |
|  | At November 26, 2017 |  |  | At May 28, 2017 |
Revenue growth rates |  |  | 4% |  |  |  | 4% |
Expense growth rates |  |  | 4% |  |  |  | 4% |
Income tax rates |  |  | 15% |  |  |  | 15% |
Discount rates |  |  | 12% |  |  |  | 12% |
Schedule of Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets [Table Text Block] |
|  | Impact on value of investment in Windset as of November 26, 2017 |
10% increase in revenue growth rates |  | $ | 7,400 |
10% increase in expense growth rates |  | $ | (2,000 | )
10% increase in income tax rates |  | $ | (500 | )
10% increase in discount rates |  | $ | (4,500 | )
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] |
|  | Fair Value at November 26, 2017 |  |  | Fair Value at May 28, 2017 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swap (1) |  | $ | — |  |  | $ | 909 |  |  | $ | — |  |  | $ | — |  |  | $ | 688 |  |  | $ | — |
Investment in non-public company |  |  | — |  |  |  | — |  |  |  | 65,800 |  |  |  | — |  |  |  | — |  |  |  | 63,600 |
Total |  | $ | — |  |  | $ | 909 |  |  | $ | 65,800 |  |  | $ | — |  |  | $ | 688 |  |  | $ | 63,600 |
Revenue Recognition, Multiple-deliverable Arrangements [Table Text Block] |
|  | Three Months Ended |  |  | Six Months Ended |
|  | November 26, 2017 |  |  | November 27, 2016 |  |  | November 26, 2017 |  |  | November 27, 2016 |
Recorded upon shipment |  | $ | 118,634 |  |  | $ | 107,987 |  |  | $ | 231,908 |  |  | $ | 214,152 |
Recorded upon acceptance in foreign port |  |  | 13,996 |  |  |  | 25,701 |  |  |  | 21,572 |  |  |  | 49,040 |
Revenue from multiple element arrangements |  |  | 2,132 |  |  |  | 1,683 |  |  |  | 3,701 |  |  |  | 3,268 |
Revenue from license fees, R&D contracts and royalties/profit sharing |  |  | 1,695 |  |  |  | 494 |  |  |  | 2,633 |  |  |  | 1,799 |
Total |  | $ | 136,457 |  |  | $ | 135,865 |  |  | $ | 259,814 |  |  | $ | 268,259 |

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