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Note 1 - Summary of Significant Accounting Policies (Details Textual)
$ in Thousands
12 Months Ended
Feb. 25, 2018
USD ($)
Feb. 26, 2017
USD ($)
Feb. 28, 2016
USD ($)
Mar. 01, 2015
USD ($)
Number of Reportable Segments 2      
Cash and Cash Equivalents, at Carrying Value, Ending Balance $ 18,254 $ 102,438 $ 97,757 $ 141,538
Cash and Marketable Securities $ 108,231      
Sales Returns and Allowance as Percentage of Sales 1.00% 1.00% 1.00%  
Impairment of Long-Lived Assets Held-for-use $ 67 $ 0 $ 0  
Finite-Lived Intangible Asset, Useful Life 15 years      
Selling, General and Administrative Expense, Total $ 19,371 19,739 21,211  
Depreciation, Depletion and Amortization, Total 3,021 3,106 3,369  
Goodwill, Impairment Loss $ 0 0 0  
Machinery, Equipment, Furniture and Fixtures [Member]        
Property, Plant and Equipment, Useful Life 10 years      
Land, Buildings and Improvements [Member] | Minimum [Member]        
Property, Plant and Equipment, Useful Life 25 years      
Land, Buildings and Improvements [Member] | Maximum [Member]        
Property, Plant and Equipment, Useful Life 30 years      
Shipping Costs [Member]        
Selling, General and Administrative Expense, Total $ 2,565 2,354 $ 2,855  
Cash and Cash Equivalents, Foreign Financial Institutions [Member]        
Cash and Cash Equivalents, at Carrying Value, Ending Balance 7,513 22,218    
Company’s Wholly Owned Foreign Subsidiaries [Member]        
Cash and Marketable Securities 108,040      
Debt Securities [Member]        
Cash and Cash Equivalents, at Carrying Value, Ending Balance $ 4,983 $ 29,942