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Note 13 - Operations and Industry Segments (Tables)
 6 Months Ended
Apr. 01, 2017
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
Three Months Ended
    
Six Months Ended
  
   
April 1,
    
April 2,
    
April 1,
    
April 2,
  
   
2017
    
2016
    
2017
    
2016
  
Net sales:
                                
Medical
   $
12,927,831
    $
10,972,017
    $
25,445,982
    $
22,364,814
 
Custom products
    
2,298,045
     
3,880,612
     
5,002,523
     
13,939,997
 
    $
15,225,876
    $
14,852,629
    $
30,448,505
    $
36,304,811
 
                                 
Operating profit (loss):
                                
Medical
   $
1,781,601
    $
1,229,251
    $
3,388,046
    $
2,731,102
 
Custom products
    
(76,908
 )    
154,420
     
(90,089
 )    
359,220
 
     
1,704,693
     
1,383,671
     
3,297,957
     
3,090,322
 
                                 
Corporate expense
    
(301,628
 )    
(223,481
 )    
(503,652
 )    
(373,677
 )
Other income (expense)
    
737,410
     
(53,441
 )    
771,062
     
54,856
 
Income before income taxes
   $
2,140,475
    $
1,106,749
    $
3,565,367
    $
2,771,501