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Note 4 - Property and Equipment, Net (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 9 Months Ended
Mar. 26, 2015
Sep. 30, 2015
Dec. 28, 2014
Office Facility Located in Minnetonka Minnesota [Member]      
Disposal Group, Including Discontinued Operation, Consideration $ 4,700    
Purchase and Sale Agreement Fees and Closing Costs 300    
Property, Plant and Equipment, Net $ 4,800    
Property, Plant and Equipment, Net   $ 109,234 $ 32,739
Impairment of Long-Lived Assets to be Disposed of   $ 400