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Note 6 - Shareholders' Equity (Tables)
12 Months Ended
Feb. 25, 2018
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
February 25, 2018
   
February 26, 2017
 
                 
Currency translation adjustment
  $
1,310
    $
1,360
 
Unrealized gains (losses) on investments, net of taxes of $(635) and $(180), respectively
   
(1,179
)    
(334
)
Accumulated balance
 
$
131
   
$
1,026