Note 11 - Financing Activities	12 Months Ended
Dec. 31, 2023
Notes to Financial Statements
Other Liabilities Disclosure [Text Block]	NOTE 11. FINANCING ACTIVITIES See Notes 2, “Summary of Significant Accounting Policies”; 3, “Fair Value Measurements”; 12, “Secured Convertible Notes”; 13, “Common Stock Warrants” and 14, “Stockholders’ Equity” for certain defined terms below and additional discussion of financing activities and related accounting policies and fair value estimates. *2023* *Warrant Reprice Transaction* In December 2023, the Company entered into a warrant reprice transaction (the “2023 Warrant Reprice Transaction”) whereby the price terms of certain May 2023 Warrants exercisable for 2,528,848 shares of common stock were amended and exercised. The price of the amended and exercised May 2023 Warrants was reduced from $1.30 to $0.25. The Company also issued to participants in the 2023 Warrant Reprice Transaction, the December 2023 Warrants exercisable for 2,528,848 shares of common stock. The 2023 Warrant Reprice Transaction resulted in gross proceeds of approximately $0.6 million. The Company allocated the gross proceeds between the common stock and December 2023 Warrants issued to participants by applying the relative fair value allocation methodology. The Company allocated $0.2 million in gross proceeds to the common stock and $0.4 million to the December 2023 Warrants which were classified as a liability upon issuance and at December 31, 2023. The Company incurred total issuance costs of $0.2 million in conjunction with the 2023 Warrant Reprice Transaction. The Company allocated $0.1 million of the issuance costs to the common stock which was recorded as a reduction of additional paid-in capital in the Company’s consolidated balance sheets. The remaining $0.1 million was allocated to the warrant liability and expensed as “Other expense, net” in the Company’s consolidated statements of operations during the year ended December 31, 2023. *2023* *Private Placement* In May 2023, the Company closed a private placement (the “2023 Private Placement”) with existing accredited institutional investors of the Company that provided for the issuance and sale of $3.3 million aggregate principal amount of the Secured Convertible Notes and the May 2023 Warrants exercisable for up to 5,076,928 shares of common stock. The Company received gross proceeds of $3.0 million from the 2023 Private Placement. The Company allocated the proceeds from the 2023 Private Placement between the May 2023 Warrants, an embedded derivative liability, and the Secured Convertible Notes by applying the residual fair value methodology. The Company first allocated $1.6 million to the May 2023 Warrants and $0.2 million to the embedded derivative liability with the residual $1.2 million allocated to the Secured Convertible Notes. The embedded derivative liability was subsequently reclassified to equity upon stockholder approval. The Company incurred total issuance costs of $0.7 million in conjunction with the 2023 Private Placement, including a $0.4 million non-cash loss on the warrant modification. The Company allocated $0.3 million of the issuance costs to the Secured Convertible Notes which was recorded as a discount in the Company’s consolidated balance sheets. The remaining $0.4 million was allocated to the embedded derivative liability and warrant liability and expensed as “Other expense, net” in the Company’s consolidated statements of operations during the year ended December 31, 2023. *2022* *Warrant Reprice Transaction* In September 2022, the Company entered into a warrant reprice transaction (the “2022 Warrant Reprice Transaction”) whereby certain terms of all November 2021 Warrants exercisable for 1,071,434 shares of common stock and certain July 2020 Warrants exercisable for 137,145 shares of common stock were amended. In connection with the 2022 Warrant Reprice Transaction, amended November 2021 Warrants exercisable for 267,860 shares of common stock and amended July 2020 Warrants exercisable for 60,000 shares of common stock were exercised. The Company issued to participants in the 2022 Warrant Reprice Transaction, the September 2022 Warrants exercisable for 327,860 shares of common stock. The 2022 Warrant Reprice Transaction resulted in gross proceeds of approximately $2.1 million. The Company allocated the gross proceeds between the common stock and September 2022 Warrants by applying the relative fair value allocation methodology. The Company allocated $0.7 million in gross proceeds to the common stock and $1.4 million to the September 2022 Warrants which were classified as a liability upon issuance and later reclassified to equity upon stockholder approval. The Company incurred total issuance costs of $0.5 million in conjunction with the 2022 Warrant Reprice Transaction. The Company allocated $0.3 million of the issuance costs to the common stock which was recorded as a reduction of additional paid-in capital in the Company’s consolidated balance sheets. The remaining $0.2 million was allocated to the warrant liability and expensed as “Other expense, net” in the Company’s consolidated statements of operations during the year ended December 31, 2022.

Note 11 - Financing Activities

12 Months Ended

Dec. 31, 2023

Other Liabilities Disclosure [Text Block]

NOTE 11. FINANCING ACTIVITIES

See Notes 2, “Summary of Significant Accounting Policies”; 3, “Fair Value Measurements”; 12, “Secured Convertible Notes”; 13, “Common Stock Warrants” and 14, “Stockholders’ Equity” for certain defined terms below and additional discussion of financing activities and related accounting policies and fair value estimates.

2023 Warrant Reprice Transaction

In December 2023, the Company entered into a warrant reprice transaction (the “2023 Warrant Reprice Transaction”) whereby the price terms of certain May 2023 Warrants exercisable for 2,528,848 shares of common stock were amended and exercised. The price of the amended and exercised May 2023 Warrants was reduced from $1.30 to $0.25. The Company also issued to participants in the 2023 Warrant Reprice Transaction, the December 2023 Warrants exercisable for 2,528,848 shares of common stock.

The 2023 Warrant Reprice Transaction resulted in gross proceeds of approximately $0.6 million. The Company allocated the gross proceeds between the common stock and December 2023 Warrants issued to participants by applying the relative fair value allocation methodology. The Company allocated $0.2 million in gross proceeds to the common stock and $0.4 million to the December 2023 Warrants which were classified as a liability upon issuance and at December 31, 2023.

The Company incurred total issuance costs of $0.2 million in conjunction with the 2023 Warrant Reprice Transaction. The Company allocated $0.1 million of the issuance costs to the common stock which was recorded as a reduction of additional paid-in capital in the Company’s consolidated balance sheets. The remaining $0.1 million was allocated to the warrant liability and expensed as “Other expense, net” in the Company’s consolidated statements of operations during the year ended December 31, 2023.

2023 Private Placement

In May 2023, the Company closed a private placement (the “2023 Private Placement”) with existing accredited institutional investors of the Company that provided for the issuance and sale of $3.3 million aggregate principal amount of the Secured Convertible Notes and the May 2023 Warrants exercisable for up to 5,076,928 shares of common stock.

The Company received gross proceeds of $3.0 million from the 2023 Private Placement. The Company allocated the proceeds from the 2023 Private Placement between the May 2023 Warrants, an embedded derivative liability, and the Secured Convertible Notes by applying the residual fair value methodology. The Company first allocated $1.6 million to the May 2023 Warrants and $0.2 million to the embedded derivative liability with the residual $1.2 million allocated to the Secured Convertible Notes. The embedded derivative liability was subsequently reclassified to equity upon stockholder approval.

The Company incurred total issuance costs of $0.7 million in conjunction with the 2023 Private Placement, including a $0.4 million non-cash loss on the warrant modification. The Company allocated $0.3 million of the issuance costs to the Secured Convertible Notes which was recorded as a discount in the Company’s consolidated balance sheets. The remaining $0.4 million was allocated to the embedded derivative liability and warrant liability and expensed as “Other expense, net” in the Company’s consolidated statements of operations during the year ended December 31, 2023.

2022 Warrant Reprice Transaction

In September 2022, the Company entered into a warrant reprice transaction (the “2022 Warrant Reprice Transaction”) whereby certain terms of all November 2021 Warrants exercisable for 1,071,434 shares of common stock and certain July 2020 Warrants exercisable for 137,145 shares of common stock were amended. In connection with the 2022 Warrant Reprice Transaction, amended November 2021 Warrants exercisable for 267,860 shares of common stock and amended July 2020 Warrants exercisable for 60,000 shares of common stock were exercised. The Company issued to participants in the 2022 Warrant Reprice Transaction, the September 2022 Warrants exercisable for 327,860 shares of common stock.

The 2022 Warrant Reprice Transaction resulted in gross proceeds of approximately $2.1 million. The Company allocated the gross proceeds between the common stock and September 2022 Warrants by applying the relative fair value allocation methodology. The Company allocated $0.7 million in gross proceeds to the common stock and $1.4 million to the September 2022 Warrants which were classified as a liability upon issuance and later reclassified to equity upon stockholder approval.

The Company incurred total issuance costs of $0.5 million in conjunction with the 2022 Warrant Reprice Transaction. The Company allocated $0.3 million of the issuance costs to the common stock which was recorded as a reduction of additional paid-in capital in the Company’s consolidated balance sheets. The remaining $0.2 million was allocated to the warrant liability and expensed as “Other expense, net” in the Company’s consolidated statements of operations during the year ended December 31, 2022.