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Note 6 - Income Taxes (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Nov. 25, 2018
Nov. 26, 2017
Nov. 25, 2018
Nov. 26, 2017
May 27, 2018
May 28, 2017
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent     25.00% 35.00% 29.40% 35.00%
Tax Cuts And Jobs Act Of 2017 Measurement Period Adjustment Income Tax Expense Benefit $ 347,000   $ 347,000      
Income Tax Expense (Benefit), Total 277,000 $ 165,000 342,000 $ 1,475,000    
Unrecognized Tax Benefits, Ending Balance 582,000   582,000   $ 479,000  
Unrecognized Tax Benefits that Would Impact Effective Tax Rate $ 507,000   $ 507,000   $ 372,000