Note 9 - Segment Information and Business and Credit Concentrations (Details Textual) - Sales Revenue, Net [Member] |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Apr. 30, 2016 |
Apr. 30, 2015 |
Apr. 30, 2016 |
Apr. 30, 2015 |
|
| Customer Concentration Risk [Member] | Customer One [Member] | ||||
| Concentration Risk, Percentage | 9.30% | 14.70% | 9.50% | 14.00% |
| Customer Concentration Risk [Member] | Customer Two [Member] | ||||
| Concentration Risk, Percentage | 14.10% | 14.80% | 13.10% | 13.40% |
| Customer Concentration Risk [Member] | ||||
| Concentration Risk, Number of Customers | 2 | 2 | 2 | 2 |
| Geographic Concentration Risk [Member] | UNITED STATES | ||||
| Concentration Risk, Percentage | 78.00% | 79.00% | ||
| Geographic Concentration Risk [Member] | Non-US [Member] | ||||
| Concentration Risk, Percentage | 22.00% | 21.00% | ||