The amount of equity buy-out for warrants or rights.

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The percent of maximum ownership that convertible preferred stock may convert into.

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Represents the duration after the date of issuance that warrants become exercisable.

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The number of warrants or rights exercised during period.

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Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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- Definition

Number of common shares issuable upon conversion of preferred stock.

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award.

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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Number of shares authorized for issuance under share-based payment arrangement.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Note 8 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, Rate in Thousands, $ in Thousands	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Sep. 30, 2022	May 14, 2021	Jul. 31, 2016	Oct. 27, 2014
Preferred Stock, Shares Authorized (in shares)	1,000,000		1,000,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.001		$ 0.001
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 700
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	2 years 2 months 12 days
Warrants Exercisable Term (Month)	6 months
Warrants and Rights Outstanding, Term (Year)	5 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)	50,000	5,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value	$ 0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)	8 years 3 months 18 days
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term (Year)	7 years 9 months 18 days
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value	$ 0
Share-Based Payment Arrangement, Option [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)	1,192,094		1,157,927
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)	50,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate (Rate)	0.00%
Share-Based Payment Arrangement, Tranche Three [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Exercise Price (in dollars per share)	$ 1.34	$ 4.11
Share-Based Payment Arrangement, Tranche Three [Member] \| Share-Based Payment Arrangement, Option [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)	3 years	3 years
Montage Warrant [Member]
Warrants and Rights Outstanding, Term (Year)	8 years
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 132.50
Class of Warrant or Right, Equity Buy-out	$ 250
Series A Warrants [Member]
Warrants and Rights Outstanding, Term (Year)		5 years 6 months
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 4.00
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	872,625
Series B Warrants [Member]
Warrants and Rights Outstanding, Term (Year)		24 months
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 4.00
Series C Warrants [Member]
Warrants and Rights Outstanding, Term (Year)		5 years 6 months
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 0.05
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	13,738
Placement Agent Warrants [Member]
Warrants and Rights Outstanding, Term (Year)				5 years
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 4.00		$ 2.85
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	179,536			179,536
Warrants or Rights, Exercised During Period (in shares)	0	26,605
Series C Preferred Placement Agent Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	11,992
Investor Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	41,621
Series D Preferred Stock Warrants [Member]
Warrants and Rights Outstanding, Term (Year)				5 years 6 months
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)				$ 2.51
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)				592,106
Series D Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	592,106
Warrants or Rights, Exercised During Period (in shares)	0
Amended and Restated Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)					5,000
The 2016 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)	1,650,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)	1,192,094
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)	204,907
Series A Convertible Preferred Stock [Member]
Preferred Stock, Shares Authorized (in shares)						264,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share)						$ 10
Preferred Stock, Shares Outstanding, Ending Balance (in shares)	0		0
Series B Convertible Preferred Stock [Member]
Preferred Stock, Shares Authorized (in shares)	5,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share)	$ 1,000
Preferred Stock, Shares Outstanding, Ending Balance (in shares)	0		0
Series C Convertible Preferred Stock [Member]
Preferred Stock, Shares Authorized (in shares)	11,000		11,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share)	$ 1,000
Preferred Stock, Shares Outstanding, Ending Balance (in shares)	350		350
Preferred Stock, Convertible, Shares Issuable (in shares)	38,889		38,889
Series D Convertible Preferred Stock [Member]
Preferred Stock, Par or Stated Value Per Share (in dollars per share)				$ 1,000
Preferred Stock, Shares Outstanding, Ending Balance (in shares)	0		0	4,200
Convertible Preferred Stock, Percent, Maximum Ownership				4.99%
Convertible Preferred Stock, Percent, Maximum Ownership Upon Election				9.99%