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Note 8 - Stockholders' Equity (Tables)

9 Months Ended

Jun. 30, 2022

Notes Tables

Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block]

		Three Months Ended June 30,								Nine Months Ended June 30,
		2022				2021				2022				2021
Cost of revenue		$	6			$	6			$	19			$	18
Operating expenses			86				37				188				115
Interest expense and other, net			157				-				157				-
		$	249			$	43			$	364			$	133

Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]

Type		Issue Date		Shares				Price			Expiration
Financing (Montage)		10/10/2017			1,327			$	132.50		10/10/2025
Investors		10/19/2018			3,120			$	25.00		10/19/2023
Placement Agent		10/16/2018			10,000			$	31.25		10/16/2023
Investors		3/12/2019			41,621			$	4.00		10/19/2023
Investors		3/12/2019			872,625			$	4.00		9/12/2024
Investors		3/12/2019			13,738			$	0.05		9/12/2024
Placement Agent		3/12/2019			11,992			$	4.00		9/12/2024
Placement Agent		2/4/2021			31,564			$	3.88		2/4/2026
Investors		5/14/2021			592,106			$	2.51		11/16/2026
Placement Agent		5/14/2021			179,536			$	2.85		5/12/2026
Total					1,757,629

Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

		Board				Non-Board
Weighted-average fair value per share option		$	1.30			$	1.40
Expected life (in years)			5.0				6.0
Volatility			89.2	%			95.0	%
Risk-free interest rate			2.80	%			2.80	%
Dividend yield			0.0	%			0.0	%

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

		Stock Options								Stock Warrants
						Weighted -								Weighted -
						Average								Average
						Exercise								Exercise
		Options				Price				Warrants				Price
Outstanding, October 1, 2021			765,232			$	4.66				1,788,745			$	4.18
Granted			535,000				1.82				-				-
Exercised			(13,333	)			1.40				(26,605	)			3.88
Forfeited			(108,700	)			2.38				-				-
Expired			(134	)			937.88				(4,511	)			218.89
Outstanding, June 30, 2022			1,178,065				3.60				1,757,629				3.64
Options vested and exercisable, June 30, 2022			586,765				5.33

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