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Note 7 - Major Customer Concentration (Tables)
6 Months Ended
Mar. 31, 2016
Notes Tables  
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
    Three Months Ended March 31,   Six Months Ended March 31,
    2016   2015   2016   2015
Customer A     21 %     31 %     23 %     27 %
Customer B     18 %    
*
      15 %    
*