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Note 3 - Restructuring Charges (Details Textual) - USD ($)
1 Months Ended
Mar. 16, 2020
Jan. 20, 2022
Jan. 01, 2022
Oct. 02, 2021
Jan. 02, 2021
Oct. 03, 2020
Restructuring Reserve, Ending Balance     $ 4,000 $ 10,000 $ 47,000 $ 171,000
Restructuring and Related Cost, Expected Cost Remaining     250,000      
Accrued Expenses [Member]            
Restructuring Reserve, Ending Balance     $ 4,000 $ 10,000    
Subsequent Event [Member] | The Summerville Facility [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]            
Proceeds from Sale of Assets Held for Sale   $ 6,800,000        
Gain (Loss) on Sale of Assets Held for Sale   $ 470,000        
STM Acquisition [Member]            
Business Combination, Consideration Transferred, Total $ 19,400,000          
Business Combination, Consideration Transferred, Liabilities Incurred $ 1,000,000.0