Note 5 - Stockholders' Equity (Deficit) (Tables)

12 Months Ended

Sep. 30, 2022

Notes Tables

Schedule of Stock Options Roll Forward [Table Text Block]

	Qualified
	Employee			Director
	Stock Option			Stock Option
	Plans			Plan
Shares available for grant at September 30, 2020		911,617			55,500
Shareholder approval of 2020 Equity Incentive Stock Option Plan		1,000,000			—
Options granted		(550,467	)		(28,000	)
Options forfeited		258,448			46,500
Shares available for grant at September 30, 2021		1,619,598			74,000
Remaining 2009 Plan shares cancelled		(1,060,524	)		—
Approval of additional 1 million shares Equity Incentive Stock Option Plan		1,000,000			—
Options granted		(877,250	)		(13,500	)
Options forfeited, cancelled, and expired		479,593			3,000
Shares available for grant at September 30, 2022		1,161,417			63,500

Share-Based Payment Arrangement, Option, Activity [Table Text Block]

	Years Ended September 30,
	2022					2021
				Weighted					Weighted
				Average					Average
				Exercise					Exercise
	Options			Price		Options			Price
Outstanding at beginning of year		1,853,479		$	4.44		1,707,515		$	5.09
Granted		890,750			3.17		578,467			3.42
Exercised		(166,098	)		1.98		(127,555	)		2.14
Forfeited, cancelled, and expired		(482,593	)		5.99		(304,948	)		6.89
Outstanding at end of year		2,095,538		$	3.74		1,853,479		$	4.44
Exercisable at end of year		1,163,820		$	4.15		1,269,854
Weighted average fair value of options granted during the year	$	1.48				$	1.57

Share-Based Payment Arrangement, Option, Exercise Price Range [Table Text Block]

	Options Outstanding						Options Exercisable
	Options		Weighted
	Outstanding		Average		Weighted		Options		Weighted
	at		Remaining		Average		Exercisable at		Average
	September 30,		Contractual		Exercise		September 30,		Exercise
Exercise Prices	2022		Life		Price		2022		Price
$0.66 to $2.49		377,032		6.46	$	1.57		311,612	$	1.60
$2.61 to $4.81		1,455,838		8.52	$	3.44		589,874	$	3.55
$5.08 to $8.92		155,558		1.71	$	7.44		155,224	$	7.44
$9.08 to $10.92		107,110		1.65	$	10.09		107,110	$	10.09
		2,095,538						1,163,820

Schedule of Nonvested Share Activity [Table Text Block]

				Weighted Average
				Grant Date
	Options			Fair Value
Non-vested options at October 1, 2020		339,897		$	0.60
Granted		578,467			1.57
Vested		(283,741	)		0.98
Forfeited		(51,165	)		1.09
Non-vested options at September 30, 2021		583,458			1.43
Granted		890,750			1.48
Vested		(456,174	)		1.19
Forfeited		(86,316	)		1.21
Non-vested options at September 30, 2022		931,718		$	1.57