Deferred fee plan (Details) - USD ($) |
6 Months Ended | ||
|---|---|---|---|
Apr. 30, 2019 |
Apr. 30, 2018 |
Oct. 31, 2018 |
|
| Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] | |||
| Dividends payable | $ 848,000 | $ 337,000 | $ 338,000 |
| Deferred Fee Plan [Member] | |||
| Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] | |||
| Trustee fee expense | 471,200 | 423,300 | |
| Deferred trustee fees | $ 517,300 | $ 430,000 | |
| Basis spread on any deferred fee (percentage) | 1.50% | ||
| Term of distribution to participants | 10 years | ||
| Shares issued | 32,753 | 28,118 | |
| Dividends payable | $ 46,100 | $ 6,700 | |