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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Jan. 31, 2026
Jan. 31, 2025
Reconciliation of net loss to net cash used in operating activities:    
Net loss $ (2,585) $ (3,213)
Stock option compensation to employees and directors 768 1,031
Stock options issued to consultants 28 24
Amortization of operating lease right-of-use asset 10 9
Amortization of discount on held-to-maturity securities 47 (252)
Change in operating assets and liabilities:    
Prepaid expenses and other current assets (135) 7
Accounts payable (17) 75
Accrued expenses (715) (583)
Operating lease liability (11) (2)
Net cash used in operating activities (2,610) (2,904)
Cash flows from investing activities:    
Disbursements to acquire short-term investments (12,532) (12,997)
Proceeds from maturities of short-term investments 13,760 15,700
Net cash provided by investing activities 1,228 2,703
Cash flows from financing activities:    
Net proceeds (expenses) from an at-the-market offering 1,625 (17)
Proceeds from exercise of stock options 60
Net cash provided by (used in) financing activities 1,685 (17)
Net increase (decrease) in cash and cash equivalents 303 (218)
Cash and cash equivalents at beginning of period 1,244 1,271
Cash and cash equivalents at end of period $ 1,547 $ 1,053