2. Basis of Presentation and Significant Accounting Policies: PASSUR Network (Details) - USD ($)			3 Months Ended		6 Months Ended		12 Months Ended
	Apr. 30, 2021	Oct. 31, 2020	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020	Oct. 31, 2020
Impairment Of Long Lived Assets, Held For Use (Rounded)							$ 9,874,000
PASSUR Network Parts Used in Repairs					$ 0	$ 9,300
Depreciation of PASSUR Network costs			$ 0	$ 148,000	$ 0	$ 374,000
PASSUR NETWORK, Net (Rounded)	$ 0	$ 0
Passur Network 1
Impairment Of Long Lived Assets, Held For Use (Rounded)							3,565,000
Impairment of Leasehold							$ 175,000