4. Passur Network (Details) - USD ($)	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016
Capitalized costs of PASSUR Network	$ 1,197,000	$ 489,000
Passur Network Depreciation	595,000	773,000
Cost of uninstalled PASSUR Systems	1,636,000	1,815,000
Cost of uninstalled SMLAT Systems	642,000	$ 911,000
PassurNetwork1Member
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	673,000
Finite-Lived Intangible Assets, Amortization Expense, Year Two	659,000
Finite-Lived Intangible Assets, Amortization Expense, Year Three	626,000
Finite-Lived Intangible Assets, Amortization Expense, Year Four	412,000
Finite-Lived Intangible Assets, Amortization Expense, Year Five	$ 255,000