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Note 6 - Stock-Based Compensation (Details Textual) - USD ($)
9 Months Ended
Jun. 27, 2015
Jun. 28, 2014
Feb. 17, 2015
Employee Stock Option [Member]      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options $ 287,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year 167 days    
Restricted Stock Units (RSUs) [Member] | Director [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1 year    
Restricted Stock Units (RSUs) [Member] | Employees [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized     900,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 801,000    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year 160 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 7.75 $ 6.93  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options $ 621,000