Note 8 - Net Income (Loss) Per Share - Components of Reconciliation of Numerators and Denominators Net Loss Per Share (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Net income (loss) (numerator)	$ 438,353	$ (295,160)	$ 1,419,083	$ (1,150,009)
Shares (denominator) (in shares)	7,696,068	6,490,205	7,559,340	6,538,621
Basic and diluted net income (loss) per share (in dollars per share)	$ 0.06	$ (0.05)	$ 0.19	$ (0.18)