Represents the number of warrants or rights for which the put feature was settled during the period.

No definition available.

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- Definition

Liability classified warrants.

+ References

No definition available.

+ Details

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- Definition

The aggregate purchase price under a securities purchase agreement, representing a maximum aggregate original issue discount and warrants to purchase shares of common stock.

+ References

No definition available.

+ Details

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- Definition

The maximum original issue discount, a component of the aggregate purchase price under a securities purchase agreement.

+ References

No definition available.

+ Details

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- Definition

Represents the maximum borrowing capacity associated with a securities purchase agreement.

+ References

No definition available.

+ Details

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- Definition

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
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644

+ Details

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- Definition

Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares.

+ References

No definition available.

+ Details

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- Definition

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.

+ References

+ Details

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- Definition

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Value of input used to measure outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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Note 5 - Fair Value Measurements (Details Textual)	3 Months Ended	9 Months Ended
Note 5 - Fair Value Measurements (Details Textual)	Jun. 30, 2021 shares	Sep. 30, 2021 USD ($) $ / shares shares	Nov. 08, 2021 shares	Jul. 21, 2021 USD ($) $ / shares shares	May 25, 2021 USD ($)	May 20, 2021 $ / shares shares	Feb. 01, 2021 USD ($) $ / shares	Dec. 31, 2020 USD ($) shares	Dec. 16, 2020 USD ($)
Derivative Liability, Noncurrent		$ 9,434,000						$ 1,830,000
Warrants and Rights Outstanding, Measurement Input				3,900,000
Common stock, shares issued (in shares) \| shares		12,929,911						2,774,501
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) \| shares			644,138
Liability classified warrants		$ 0
Maximum [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) \| $ / shares		$ 4,695.60
Minimum [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) \| $ / shares		$ 3.45
Senior Secured Promissory Note Warrants [Member]
Derivative Liability, Noncurrent		$ 1,100,000					$ 1,800,000	$ 1,900,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) \| $ / shares		$ 3.88
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) \| shares		858,892
Senior Secured Promissory Note Warrants [Member] \| Measurement Input, Share Price [Member]
Warrants and Rights Outstanding, Measurement Input		2.65					(17.71)	17.71
Senior Secured Promissory Note Warrants [Member] \| Measurement Input, Price Volatility [Member]
Warrants and Rights Outstanding, Measurement Input		0.723					0.88	0.87
Senior Secured Promissory Note Warrants [Member] \| Measurement Input, Risk Free Interest Rate [Member]
Warrants and Rights Outstanding, Measurement Input		0.98					0.50	0.50
Senior Secured Promissory Note Warrants [Member] \| Measurement Input, Expected Term [Member]
Warrants and Rights Outstanding, Measurement Input		4.9					5.8	6
Senior Secured Promissory Note Warrants [Member] \| Measurement Input, Expected Dividend Rate [Member]
Warrants and Rights Outstanding, Measurement Input		0					0	0
Senior Secured Promissory Note Warrants [Member] \| Measurement Input, Exercise Price [Member]
Warrants and Rights Outstanding, Measurement Input		3.88
Senior Secured Promissory Note Warrants [Member] \| Altium Growth Fund, LP [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) \| $ / shares							$ 17.71
Securities Purchase Agreement, Maximum Borrowing Capacity									$ 5,000,000.0
Securities Purchase Agreement, Aggregate Purchase Price									3,750,000
Securities Purchase Agreement, Aggregate Purchase Price, Original Issue Discount									$ 1,250,000
The Equity Warrant [Member]
Derivative Liability, Noncurrent				$ 1,700,000	$ 21,900,000
The Equity Warrant [Member] \| Measurement Input, Share Price [Member]
Warrants and Rights Outstanding, Measurement Input				3.58	10.15
The Equity Warrant [Member] \| Measurement Input, Price Volatility [Member]
Warrants and Rights Outstanding, Measurement Input				99.10	0.91
The Equity Warrant [Member] \| Measurement Input, Risk Free Interest Rate [Member]
Warrants and Rights Outstanding, Measurement Input				0.82	0.01
The Equity Warrant [Member] \| Measurement Input, Expected Term [Member]
Warrants and Rights Outstanding, Measurement Input				5.5	5.6
The Equity Warrant [Member] \| Measurement Input, Expected Dividend Rate [Member]
Warrants and Rights Outstanding, Measurement Input				0	0
The Equity Warrant [Member] \| Altium Growth Fund, LP [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) \| $ / shares		$ 3.88				$ 4.70
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) \| shares		5,303,568				4,995,893
May 2021 Warrants [Member]
Derivative Liability, Noncurrent		$ 7,100,000
May 2021 Warrants [Member] \| Measurement Input, Share Price [Member]
Warrants and Rights Outstanding, Measurement Input		2.65
May 2021 Warrants [Member] \| Measurement Input, Price Volatility [Member]
Warrants and Rights Outstanding, Measurement Input		0.723
May 2021 Warrants [Member] \| Measurement Input, Risk Free Interest Rate [Member]
Warrants and Rights Outstanding, Measurement Input		0.98
May 2021 Warrants [Member] \| Measurement Input, Expected Term [Member]
Warrants and Rights Outstanding, Measurement Input		4.9
May 2021 Warrants [Member] \| Measurement Input, Expected Dividend Rate [Member]
Warrants and Rights Outstanding, Measurement Input		0
May 2021 Warrants [Member] \| Measurement Input, Exercise Price [Member]
Warrants and Rights Outstanding, Measurement Input		3.88
July 2021 Warrants [Member]
Derivative Liability, Noncurrent		$ 1,200,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) \| $ / shares				$ 3.631
July 2021 Warrants [Member] \| Measurement Input, Share Price [Member]
Warrants and Rights Outstanding, Measurement Input		2.74
July 2021 Warrants [Member] \| Measurement Input, Price Volatility [Member]
Warrants and Rights Outstanding, Measurement Input		95.20
July 2021 Warrants [Member] \| Measurement Input, Risk Free Interest Rate [Member]
Warrants and Rights Outstanding, Measurement Input		1.03
July 2021 Warrants [Member] \| Measurement Input, Expected Term [Member]
Warrants and Rights Outstanding, Measurement Input		5.3
July 2021 Warrants [Member] \| Measurement Input, Expected Dividend Rate [Member]
Warrants and Rights Outstanding, Measurement Input		0
July 2021 Warrants [Member] \| Maximum [Member]
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) \| shares				1,100,000
Warrants Issued in Connection with May 2016 and August 2017 Offerings [Member]
Class of Warrant or Right, Put Feature Settled (in shares) \| shares	7,813
Warrants Associated with the October 2018 Offering [Member]
Class of Warrant or Right, Put Feature Settled (in shares) \| shares	12,500