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Note 8 - Acquisitions (Details Textual) - USD ($)
 3 Months Ended 9 Months Ended
Jun. 28, 2020
Mar. 29, 2020
Dec. 29, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 30, 2018
Jun. 28, 2020
Jun. 30, 2019
Revenue from Contract with Customer, Including Assessed Tax $ 182,528,000     $ 127,284,000     $ 426,238,000 $ 386,189,000
Net Income (Loss) Attributable to Parent, Total (1,275,000) $ (5,367,000) $ 5,320,000 5,766,000 $ (2,678,000) $ 10,361,000 (1,320,000) 13,449,000
Interest Expense, Total 13,135,000     11,860,000     35,377,000 36,256,000
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total (727,000)     6,172,000     2,000 14,564,000
BHMG [Member]                
Revenue from Contract with Customer, Including Assessed Tax 91,173,000           105,820,000  
Net Income (Loss) Attributable to Parent, Total 2,831,000           3,395,000  
Interest Expense, Total 2,363,000           2,726,000  
BHMG [Member] | Acquisition-related Costs [Member]                
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total $ 0     $ 3,147,000     $ 8,900,000 $ 8,564,000