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Note 4 - Property and Equipment, Net (Details) - USD ($) $ in Thousands |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 26, 2015 | Mar. 29, 2015 | Jun. 28, 2015 | Dec. 28, 2014
Note 4 - Property and Equipment, Net (Details) [Line Items] |  |  |  |
Property, Plant and Equipment, Net |  |  | $ 27,846 | $ 32,739
Office Facility Located in Minnetonka, Minnesota [Member] |  |  |  |
Note 4 - Property and Equipment, Net (Details) [Line Items] |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration | $ 4,700 |  |  |
Purchase and Sale Agreement, Fees and Closing Costs | 300 |  |  |
Office Facility Located in Minnetonka, Minnesota [Member] |  |  |  |
Note 4 - Property and Equipment, Net (Details) [Line Items] |  |  |  |
Property, Plant and Equipment, Net | $ 4,800 |  |  |
Impairment of Long-Lived Assets to be Disposed of |  | $ 400 |  |

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