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CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($)
shares in Thousands
 3 Months Ended
Aug. 28, 2022
Aug. 29, 2021
Income Statement [Abstract]    
Product sales $ 43,355,000 $ 41,632,000
Cost of product sales 37,103,000 31,197,000
Gross profit 6,252,000 10,435,000
Operating costs and expenses:    
Research and development 2,048,000 1,873,000
Selling, general and administrative 10,661,000 9,470,000
Restructuring costs 1,047,000 1,834,000
Total operating costs and expenses 13,756,000 13,177,000
Operating loss (7,504,000) (2,742,000)
Interest income 15,000 27,000
Interest expense (3,678,000) (6,678,000)
Other income (expense), net (180,000) 109,000
Net loss before tax (11,347,000) (9,284,000)
Income tax (expense) benefit (4,000.0) 1,651,000
Net loss from continuing operations (11,351,000) (7,633,000)
Loss from discontinued operations, net of tax 0 (1,844,000)
Net loss $ (11,351,000) $ (9,477,000)
Basic net loss per share:    
Loss from continuing operations - basic (in dollars per share) $ (0.38) $ (0.26)
Loss from discontinued operations- basic (in dollars per share) 0 (0.06)
Total basic net loss per share (in dollars per share) (0.38) (0.32)
Diluted net loss per share:    
Loss from continuing operations - diluted (in dollars per share) (0.38) (0.26)
Loss from discontinued operations- diluted (in dollars per share) 0 (0.06)
Total diluted net loss per share (in dollars per share) $ (0.38) $ (0.32)
Shares used in per share computation:    
Basic (in shares) 29,577 29,424
Diluted (in shares) 29,577 29,424
Other comprehensive income (loss), net of tax:    
Net unrealized gain (losses) on interest rate swaps (net of tax effect of $(16) and $(90)) $ 300,000 $ 366,000
Other comprehensive income, net 300,000 366,000
Total comprehensive loss $ (11,051,000) $ (9,111,000)
Revenue from Contract with Customer, Product and Service [Extensible Enumeration] Product [Member] Product [Member]
Cost, Product and Service [Extensible Enumeration] Product [Member] Product [Member]