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Note 1 - Basis of Presentation (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 02, 2017
Aug. 31, 2019
Dec. 01, 2018
Retained Earnings (Accumulated Deficit), Ending Balance   $ 1,360,463 $ 1,286,289
Accounting Standards Update 2014-09 [Member]      
Retained Earnings (Accumulated Deficit), Ending Balance     1,776
Accounting Standards Update 2016-16 [Member]      
Retained Earnings (Accumulated Deficit), Ending Balance     $ 733
Accounting Standards Update 2016-15 [Member] | reclassification of Debt Prepayment and Extinguishment Costs From Operating to Financing Cash Outflows [Member]      
Current Period Reclassification Adjustment $ 16,598