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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Feb. 27, 2022
Feb. 28, 2021
Mar. 01, 2020
Jul. 25, 2018
Cash and Marketable Securities $ 110,360      
Cash and Cash Equivalents, at Carrying Value, Ending Balance 12,811 $ 41,595    
Sales Returns and Allowance as Percentage of Sales   1.00%    
Impairment of Long-Lived Assets Held-for-use $ 0 $ 1,318 $ 0  
Finite-Lived Intangible Asset, Useful Life (Year) 15 years      
Goodwill, Impairment Loss $ 0 0    
Depreciation, Depletion and Amortization, Total $ 1,136 1,150 $ 1,544  
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, Including Discontinued Operations, Total $ 2,929      
Cash and Cash Equivalents, at Carrying Value, Ending Balance   12,446    
Company’s Wholly Owned Foreign Subsidiaries [Member]        
Cash and Marketable Securities 29,595      
Debt Securities [Member]        
Cash and Cash Equivalents, at Carrying Value, Including Discontinued Operations, Total $ 5,998 $ 29,492    
Electronics Business [Member] | Electronics Business [Member]        
Disposal Group, Including Discontinued Operation, Consideration       $ 145,000