Note 3 - Allowance for Doubtful Accounts for Trade Accounts Receivable - Summary of Changes in the Allowance for Doubtful Accounts for Trade Accounts Receivable (Details) - USD ($) |
6 Months Ended | |
|---|---|---|
Apr. 30, 2016 |
Apr. 30, 2015 |
|
| Balance at beginning of period | $ 63,011 | $ 92,988 |
| Bad debt expense (recovery) | $ 12,019 | (17,264) |
| Losses charged to allowance | (6,820) | |
| Balance at end of period | $ 75,030 | $ 68,904 |