Annual report pursuant to Section 13 and 15(d)

Note 12 - Stock-based Compensation - Unvested Restricted Stock Units and Performance Units (Details)

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Note 12 - Stock-based Compensation - Unvested Restricted Stock Units and Performance Units (Details) - $ / shares
Sep. 28, 2019
Sep. 29, 2018
Sep. 30, 2017
Number of units (in shares) 283,500 532,500 512,856
Average market price on date of grant (in dollars per share) $ 19.78 $ 16.12 $ 13.09
FY 2017 Performance Units Vesting November 2019, Price $17.97 [Member] | The 2010 Stock Plan [Member]      
Number of units (in shares) 42,000    
Average market price on date of grant (in dollars per share) $ 17.97    
FY 2017 Performance Units Vesting November 2020, Price $17.97 [Member] | The 2010 Stock Plan [Member]      
Number of units (in shares) 42,000    
Average market price on date of grant (in dollars per share) $ 17.97    
FY 2018 Restricted Stock Units Vesting November 2019, Price $21.51 [Member] | The 2010 Stock Plan [Member]      
Number of units (in shares) 52,750    
Average market price on date of grant (in dollars per share) $ 21.51    
FY 2018 Performance Units Vesting November 2019, Price $21.51 [Member] | The 2010 Stock Plan [Member]      
Number of units (in shares) 52,750    
Average market price on date of grant (in dollars per share) $ 21.51    
FY 2018 Restricted Stock Units Vesting November 2019, Price $17.97 [Member] | The 2010 Stock Plan [Member]      
Number of units (in shares) 2,000    
Average market price on date of grant (in dollars per share) $ 17.97    
FY 2018 Performance Units Vesting November 2019, Price $17.97 [Member] | The 2010 Stock Plan [Member]      
Number of units (in shares) 2,000    
Average market price on date of grant (in dollars per share) $ 17.97    
FY 2018 Restricted Stock Units Vesting November 2020, Price $19.52 [Member] | The 2010 Stock Plan [Member]      
Number of units (in shares) 90,000    
Average market price on date of grant (in dollars per share) $ 19.52    
Restricted Stock Units and Performance Units [Member] | The 2010 Stock Plan [Member]      
Number of units (in shares) 283,500    
Average market price on date of grant (in dollars per share)