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Note 2 - Acquisition of O (Details Textual) - USD ($)
12 Months Ended
Mar. 01, 2017
May 27, 2018
May 28, 2017
May 29, 2016
Payments to Acquire Businesses, Gross   $ 2,500,000
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability   (1,900,000)
Finite-lived Intangible Assets Acquired     2,300,000  
Goodwill, Ending Balance   $ 54,510,000 54,510,000  
O Olive & Vinegar [Member]        
Payments to Acquire Businesses, Gross $ 2,500,000      
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High $ 7,500,000      
Contingent Consideration Payment Period 3 years 3 years    
Cumulative EBITDA Amount   $ 6,000,000    
Business Combination, Contingent Consideration, Liability, Total   4,000,000 5,900,000  
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual   3,800,000    
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual   (960,000)    
Finite-Lived Intangible Asset, Useful Life 11 years      
Goodwill, Ending Balance $ 5,200,000      
Business Acquisition, Transaction Costs     $ 159,000  
O Olive & Vinegar [Member] | Customer Lists [Member]        
Finite-lived Intangible Assets Acquired 700,000      
O Olive & Vinegar [Member] | Trademarks and Trade Names [Member]        
Indefinite-lived Intangible Assets Acquired $ 1,600,000      
O Olive & Vinegar [Member] | Selling, General and Administrative Expenses [Member]        
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability   1,900,000    
O Olive & Vinegar [Member] | Initial Potential Payment Limit [Member]        
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High   4,600,000    
O Olive & Vinegar [Member] | Additional Potential Payment Limit [Member]        
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High   $ 2,900,000