Note 5 - Fair Value Measurement and Fair Value of Financial Instruments (Tables)

12 Months Ended

Sep. 30, 2020

Notes Tables

Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]

	As of September 30,												As of initial
	2020						2019						valuation date
	Montage Capital			Series C Preferred			Montage Capital			Series C Preferred			Series C Preferred
Volatility		84	%		84.1	%		71	%		80.9	%		76.8	%
Risk-free rate		0.28	%		0.20	%		1.59	%		1.59	%		2.40	%
Stock price	$	1.86		$	1.86		$	1.91		$	1.91		$	12.50

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

	As of September 30, 2020
	Level 1		Level 2		Level 3		Total
Liabilities:
Warrant liability - Montage	$	-	$	-	$	26	$	26
Warrant liability - Series A, B and C		-		-		2,460		2,460
Total Liabilities	$	-	$	-	$	2,486	$	2,486

	As of September 30, 2019
	Level 1		Level 2		Level 3		Total
Liabilities:
Warrant liability - Montage	$	-	$	-	$	14	$	14
Warrant liability - Series A, B and C		-		-		3,500		3,500
Total Liabilities	$	-	$	-	$	3,514	$	3,514

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

Balance at beginning of period, October 1, 2018	$	180
Additions		21,500
Exercises		(4,762	)
Adjustment to fair value		(13,404	)
Balance at end of period, September 30, 2019	$	3,514
Additions		-
Exercises		-
Adjustment to fair value		(1,028	)
Balance at end of period, September 30, 2020	$	2,486