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Note F - Sales of Real Estate (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Oct. 23, 2018
Aug. 09, 2018
Mar. 31, 2019
Mar. 25, 2018
Disposal Group, Including Discontinued Operation, Consideration       $ 12,250
Assets Held-for-sale, Not Part of Disposal Group, Current, Total     $ 610
Regional Office Building in Fort Lauderdale, Florida [Member]        
Sale of Real Estate, Selling Costs   $ 17    
Proceeds from Sale of Real Estate, Total   $ 1,330    
Other Income [Member] | Regional Office Building in Fort Lauderdale, Florida [Member]        
Gains (Losses) on Sales of Other Real Estate     323  
Company Owned Restaurant in Bay Ridge [Member]        
Proceeds from Divestiture of Businesses $ 11,445      
Sale of Real Estate, Selling Costs $ 33      
Company Owned Restaurant in Bay Ridge [Member] | Other Income [Member]        
Gain (Loss) on Disposition of Business     $ 10,854