| Note 7 - Major Customer Concentration | 9 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Jun. 30, 2017 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Notes to Financial Statements | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Concentration Risk Disclosure [Text Block] | Note  7.Major Customer Concentration The following table summarizes customers comprising  10%or more of net sales for the threeand ninemonths ended  June 30, 2017 and 2016: 
 * Less than  10% As of   June 30, 2017, Customer B accounted for 18%accounts receivable. As of  September 30, 2016, Customers A and B accounted for 18%and 12%of accounts receivable, respectively. Customers A and B are both distributors. Customer C is an Alternative Carrier. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||