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Note 5 - Fair Value Measurements (Tables)
12 Months Ended
Sep. 30, 2017
Notes Tables  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
(In thousands)
 
Total
   
Quoted Prices
in Active
Markets
(Level 1)
   
Observable
Inputs
(Level 2)
 
Year ended September 30, 2017:
                       
Current assets:
                       
Cash equivalents
  $
31,659
    $
31,659
    $
-
 
Other assets:
                       
Cash surrender value of life insurance policies
   
9,026
     
-
     
9,026
 
Total
  $
40,685
    $
31,659
    $
9,026
 
                         
Year ended October 1, 2016:
                       
Current assets:
                       
Cash equivalents
  $
58,846
    $
58,846
    $
-
 
Other assets:
                       
Cash surrender value of life insurance policies
   
7,909
     
-
     
7,909
 
Total
  $
66,755
    $
58,846
    $
7,909