Note 2 - Interim Financial Presentation (Details Textual) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	May 26, 2018	May 26, 2018	Nov. 30, 2019	Nov. 24, 2018	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	21.30%	51.40%
Tax Cuts and Jobs Act of 2017 Provisional Adjustment of Deferred Tax Asset Liability	$ (155)	$ 2,032
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount	16	$ 197
Proceeds from Life Insurance Policy	$ 266
Forecast [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			21.00%