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Note 7 - Acquisitions (Details Textual) - USD ($)
 3 Months Ended 9 Months Ended
Dec. 27, 2020
Dec. 29, 2019
Dec. 27, 2020
Revenue from Contract with Customer, Including Assessed Tax $ 211,817,000 $ 122,343,000  
Net Income (Loss) Attributable to Parent, Total 15,902,000 5,320,000  
BHMG [Member]      
Goodwill, Purchase Accounting Adjustments 403,000   $ 14,984,000
Revenue from Contract with Customer, Including Assessed Tax 109,061,000    
Net Income (Loss) Attributable to Parent, Total $ 23,132,000    
BHMG [Member] | Acquisition-related Costs [Member]      
Net Income (Loss) Attributable to Parent, Total   $ 897,000