Annual report pursuant to Section 13 and 15(d)

Note E - Property and Equipment - Cost of Property and Equipment and Estimated Useful Lives (Details)

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Note E - Property and Equipment - Cost of Property and Equipment and Estimated Useful Lives (Details) - USD ($)
12 Months Ended
Jan. 01, 2022
Jan. 02, 2021
Property and equipment, gross $ 210,883,000 $ 198,517,000
Less accumulated depreciation and amortization 121,590,000 116,388,000
Property and equipment, net, excluding non-depreciable 89,293,000 82,129,000
Property and equipment, net $ 101,780,000 100,445,000
Building [Member]    
Useful life (Year) 39 years 6 months  
Property and equipment, gross $ 80,820,000 79,673,000
Laboratory and Production Equipment [Member]    
Property and equipment, gross $ 47,552,000 37,198,000
Laboratory and Production Equipment [Member] | Minimum [Member]    
Useful life (Year) 5 years  
Laboratory and Production Equipment [Member] | Maximum [Member]    
Useful life (Year) 7 years  
Air Transportation Equipment [Member]    
Useful life (Year) 5 years  
Property and equipment, gross $ 2,952 0
Computer Equipment [Member]    
Property and equipment, gross $ 53,562,000 55,965,000
Computer Equipment [Member] | Minimum [Member]    
Useful life (Year) 3 years  
Computer Equipment [Member] | Maximum [Member]    
Useful life (Year) 5 years  
Furniture and Fixtures [Member]    
Property and equipment, gross $ 6,636,000 6,517,000
Furniture and Fixtures [Member] | Minimum [Member]    
Useful life (Year) 3 years  
Furniture and Fixtures [Member] | Maximum [Member]    
Useful life (Year) 5 years  
Automobiles [Member]    
Property and equipment, gross $ 767,000 705,000
Automobiles [Member] | Minimum [Member]    
Useful life (Year) 3 years  
Automobiles [Member] | Maximum [Member]    
Useful life (Year) 5 years  
Leasehold Improvements [Member]    
Property and equipment, gross $ 15,212,000 15,242,000
Leasehold Improvements [Member] | Minimum [Member]    
Useful life (Year) 3 years  
Leasehold Improvements [Member] | Maximum [Member]    
Useful life (Year) 5 years  
Land Improvements [Member]    
Useful life (Year) 15 years  
Property and equipment, gross $ 3,382,000 3,217,000
Land [Member]    
Property and equipment, net 6,992,000 7,250,000
Deposits and Projects in Process [Member]    
Property and equipment, net $ 5,495,000 $ 11,066,000