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Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies - Fair Value of Contingent Consideration Liability (Details)
Nov. 25, 2018
May 27, 2018
Measurement Input, Cost of Debt [Member] | Minimum [Member]    
Measurement Input 0.053 0.047
Measurement Input, Cost of Debt [Member] | Maximum [Member]    
Measurement Input 0.057 0.052
Measurement Input, Market Price, Risk Adjustment [Member]    
Measurement Input 0.2 0.2
Measurement Input, EBITDA Volatility [Member]    
Measurement Input 0.24 0.25