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Note 8 - Shareholders' Equity - (Narrative) (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended
Sep. 30, 2014
Mar. 27, 2016
Mar. 29, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized stock option compensation cost   $ 509  
Weighted average period over which unrecognized stock option compensation cost will be recognized (in years)   3 years 4 months 24 days  
Cash received upon the exercise of stock options   $ 14 $ 8
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares of restricted stock awarded to certain employees 49,200    
Vesting period   3 years  
Weighted average grant date fair value $ 3.24    
Unrecognized compensation cost related to restricted stock awards   $ 38