Note 10 - Retirement Plan (Details Textual) - USD ($)	12 Months Ended
Oct. 31, 2020	Oct. 31, 2019
Defined Contribution Plan, Cost	$ 295,000	$ 181,000
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	3.00%

Amount of cost for defined contribution plan.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

Name:	us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration