Note 2 - Interim Financial Presentation (Details Textual) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Feb. 24, 2018	Nov. 30, 2019	Nov. 25, 2017
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	22.20%		35.00%
Effective Income Tax Rate Reconciliation, Percent, Total	164.20%
Tax Cuts and Jobs Act of 2017 Provisional Adjustment of Deferred Tax Asset Liability	$ 2,157
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount	$ (181)
Scenario, Forecast [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		21.00%