Note 6 - Stock-based Compensation and Equity Transactions - Options Outstanding (Details)	3 Months Ended
	Jan. 31, 2022 $ / shares shares
Outstanding at November 1, 2021 (in shares) | shares	618,858
Outstanding at November 1, 2021 (in dollars per share) | $ / shares	$ 5.33
Options granted (in shares) | shares	106,001
Options granted (in dollars per share) | $ / shares	$ 7.11
Options outstanding at January 31, 2022 (in shares) | shares	724,859
Options outstanding at January 31, 2022 (in dollars per share) | $ / shares	$ 5.59
Options exercisable at January 31, 2022 (in shares) | shares	363,067
Options exercisable at January 31, 2022 (in dollars per share) | $ / shares	$ 5.94
Options vested and expected to vest at January 31, 2022 (in shares) | shares	723,008
Options vested and expected to vest at January 31, 2022 (in dollars per share) | $ / shares	$ 5.60