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Note 12 - Discontinued Operations & Assets Held for Sale (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
May 28, 2022
May 29, 2021
May 28, 2022
May 29, 2021
Feb. 28, 2022
Nov. 27, 2021
Real Estate, Held-for-Sale $ 3,623,000   $ 3,623,000     $ 0
Houston, Texas [Member]            
Sale of Real Estate, Expected Taxable Gain (Loss)     4,800,000      
Tampa Florida [Member]            
Payments to Acquire Real Estate, Total     7,668,000      
Discontinued Operations, Disposed of by Sale [Member] | Zenith Freight Lines [Member]            
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax, Net of Working Capital Adjustment 53,254,000          
Disposal Group, Service Agreement with Buyer for Continuation of Services, Term (Year)   7 years   7 years    
Disposal Group, Including Discontinued Operation, Interest Expense   $ 78,000 78,000 $ 12,000    
Disposal Group, Including Discontinued Operation, Consideration         $ 86,939,000  
Discontinued Operations, Disposed of by Sale [Member] | Zenith Freight Lines [Member] | Subsidiaries [Member] | Logistical Services [Member]            
Related Party Transaction, Amounts of Transaction   $ 8,182,000 9,121,000 $ 16,245    
Disposal Group, Including Discontinued Operation, Operating Expense 9,546,000          
Discontinued Operations, Disposed of by Sale [Member] | Zenith Freight Lines [Member] | Other Current Liabilities and Accrued Expenses [Member]            
Disposal Group, Including Discontinued Operation, Reserve for Pre-disposal Workers'' Compensation 1,390,000   1,390,000      
Discontinued Operations, Held-for-sale [Member] | Houston, Texas [Member]            
Disposal Group, Including Discontinued Operation, Consideration $ 8,200,000   $ 8,200,000