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Note 12 - Fair Value of Financial Instruments (Tables)
12 Months Ended
Sep. 29, 2019
Notes Tables  
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]
   
2019
   
2018
   
2017
 
                         
Volatility (Percent)
   
48
     
31
     
37
 
Risk-free interest rate (Percent)
   
1.58
     
2.91
     
1.81
 
Expected term (Years)
   
2.5
     
3.5
     
4.5
 
Estimated fair value (Dollars)
   
0.20
     
0.30
     
0.26