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Note 7 - Major Customer Concentration (Tables)
 9 Months Ended
Jun. 30, 2017
Notes Tables  
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
    Three Months Ended June 30,   Nine Months Ended June 30,
    2017   2016   2017   2016
Customer A    
15
 %    
15
 %    
20
 %    
20
 %
Customer B    
15
 %    
20
 %    
15
 %    
17
 %
Customer C    
*
      
11
 %    
*
      
*