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Note 5 - Intangibles (Tables)
 3 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
   
December 31,
    
October 1,
  
   
2016
    
2016
  
Patents and trademarks
   $
2,281,073
    $
2,268,402
 
Trade names
    
335,745
     
343,678
 
Non-competition agreements
    
-
      
150,601
 
Customer relationships
    
2,467,912
     
2,526,230
 
Intangibles, cost    
5,084,730
     
5,288,911
 
Less accumulated amortization
    
(3,192,596
 )    
(3,299,012
 )
Intangibles, net   $
1,892,134
    $
1,989,899