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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. 25, 2018
Notes Tables |
Schedule of Inventory, Current [Table Text Block] |
|  | February 25 , 2018 |  |  | May 28, 2017 |
Raw materials |  | $ | 13,512 |  |  | $ | 10,158 |
Work in progress |  |  | 3,756 |  |  |  | 3,447 |
Finished goods |  |  | 11,481 |  |  |  | 11,685 |
Total |  | $ | 28,749 |  |  | $ | 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 |  |  | 483 |
Amounts reclassified from OCI |  |  | — |
Accumulated OCI, net, as of February 25, 2018 |  | $ | 915 |
Schedule of Effect of Significant Unobservable Inputs for Investment [Table Text Block] |
|  | At February 25, 2018 |  |  | At May 28, 2017 |
Revenue growth rates |  |  | 6% |  |  |  |  | 4% |
Expense growth rates |  | 5% | to | 6% |  |  |  | 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 February 25, 2018 |
10% increase in revenue growth rates |  | $ | 9,400 |
10% increase in expense growth rates |  | $ | (8,800 | )
10% increase in income tax rates |  | $ | (500 | )
10% increase in discount rates |  | $ | (4,200 | )
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] |
|  | Fair Value at February 25, 2018 |  |  | Fair Value at May 28, 2017 |
Assets (liabilities): |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Interest rate swap (1) |  | $ | — |  |  | $ | 1,467 |  |  | $ | — |  |  | $ | — |  |  | $ | 688 |  |  | $ | — |
Investment in non-public company |  |  | — |  |  |  | — |  |  |  | 65,800 |  |  |  | — |  |  |  | — |  |  |  | 63,600 |
Contingent consideration liability (2) |  |  | — |  |  |  | — |  |  |  | (5,400 | ) |  |  | — |  |  |  | — |  |  |  | (5,900 | )
Total |  | $ | — |  |  | $ | 1,467 |  |  | $ | 60,400 |  |  | $ | — |  |  | $ | 688 |  |  | $ | 57,700 |
Revenue Recognition, Multiple-deliverable Arrangements [Table Text Block] |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | February 25, 2018 |  |  | February 26, 2017 |  |  | February 25, 2018 |  |  | February 26, 2017 |
Recorded upon shipment |  | $ | 141,575 |  |  | $ | 125,765 |  |  | $ | 373,486 |  |  | $ | 339,917 |
Recorded upon acceptance in foreign port |  |  | 4,414 |  |  |  | 7,276 |  |  |  | 25,982 |  |  |  | 56,316 |
Revenue from multiple element arrangements |  |  | 1,528 |  |  |  | 2,624 |  |  |  | 5,230 |  |  |  | 5,892 |
Revenue from license fees, R&D contracts and royalties/profit sharing |  |  | 1,806 |  |  |  | 903 |  |  |  | 4,439 |  |  |  | 2,702 |
Total |  | $ | 149,323 |  |  | $ | 136,568 |  |  | $ | 409,137 |  |  | $ | 404,827 |

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