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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Mar. 01, 2020
Mar. 03, 2019
Feb. 25, 2018
Jul. 25, 2018
Cash and Cash Equivalents, at Carrying Value, Ending Balance $ 5,410 $ 71,007    
Cash and Marketable Securities   $ 126,196    
Sales Returns and Allowance as Percentage of Sales 1.00% 1.00% 1.00%  
Impairment of Long-Lived Assets Held-for-use $ 0 $ 0 $ 67  
Finite-Lived Intangible Asset, Useful Life (Year) 15 years      
Goodwill, Impairment Loss $ 0 0    
Depreciation, Depletion and Amortization, Total $ 1,544 1,784 $ 1,833  
Share-based Payment Arrangement, Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 4 years      
Minimum [Member]        
Lessee, Operating Lease, Renewal Term (Year) 1 year      
Maximum [Member]        
Lessee, Operating Lease, Renewal Term (Year) 10 years      
Machinery, Equipment, Furniture and Fixtures [Member]        
Property, Plant and Equipment, Useful Life (Year) 10 years      
Land, Buildings and Improvements [Member] | Minimum [Member]        
Property, Plant and Equipment, Useful Life (Year) 25 years      
Land, Buildings and Improvements [Member] | Maximum [Member]        
Property, Plant and Equipment, Useful Life (Year) 30 years      
Cash and Cash Equivalents, Foreign Financial Institutions [Member]        
Cash and Cash Equivalents, at Carrying Value, Ending Balance $ 21 65,144    
Company’s Wholly Owned Foreign Subsidiaries [Member]        
Cash and Marketable Securities 29,265      
Debt Securities [Member]        
Cash and Cash Equivalents, at Carrying Value, Ending Balance $ 2,496 $ 49,707    
Electronics Business [Member] | Electronics Business [Member]        
Disposal Group, Including Discontinued Operation, Consideration       $ 145,000