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Note 7 - Acquisitions (Details Textual)
 3 Months Ended 6 Months Ended
Feb. 25, 2021
Mar. 16, 2020
USD ($)
Jan. 29, 2020
USD ($)
Mar. 28, 2021
USD ($)
Dec. 27, 2020
USD ($)
Mar. 29, 2020
USD ($)
Dec. 29, 2019
USD ($)
Mar. 28, 2021
USD ($)
Mar. 29, 2020
USD ($)
Number of Real Estate Properties   68              
Operating Lease, Annual Rent Payable   $ 8,000,000              
Operating Lease, Percentage of Net Sales Proceeds   8.00%              
Revenue from Contract with Customer, Including Assessed Tax       $ 192,430,000   $ 121,367,000   $ 404,248,000 $ 243,710,000
Net Income (Loss) Attributable to Parent, Total       (1,134,000) $ 15,902,000 (5,367,000) $ 5,320,000 14,768,000 (46,000)
Reverse Stock Split [Member]                  
Stockholders' Equity Note, Stock Split, Conversion Ratio 10                
BHMG [Member]                  
Payments to Acquire Businesses, Gross   $ 140,000,000 $ 140,000,000            
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Income Tax Penalties       634,000          
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Unrecognized Tax Benefits       138,000          
Revenue from Contract with Customer, Including Assessed Tax       97,770,000       206,831,000  
Net Income (Loss) Attributable to Parent, Total       7,181,000       $ 15,951,000  
BHMG [Member] | Acquisition-related Costs [Member]                  
Net Income (Loss) Attributable to Parent, Total           $ 8,002,000     $ 8,900,000
BHMG [Member] | Customer Relationships [Member]                  
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles       $ (710,000)