Note 10 - Subsequent Events	3 Months Ended
Mar. 31, 2023
Notes to Financial Statements
Subsequent Events [Text Block]	NOTE 10 – SUBSEQUENT EVENTS Reverse Stock Split On April 19, 2023, the Company completed a one-for-twenty reverse stock split that was effective for trading purposes on April 24, 2023. No fractional shares were issued as a result of the reverse stock split. Any fractional shares that would otherwise have resulted from the reverse stock split were rounded up to the next whole number. The number of authorized shares of common stock under the Company’s certificate of incorporation, as amended, remained unchanged at 200,000,000 shares. All numbers of shares and per-share amounts in this report have been adjusted to reflect the reverse split. Proportionate reductions were made to the number of shares of common stock reserved for future issuance under our 2012 Equity Incentive Plan and the number of shares of common stock that may be issued upon exercise or vesting of outstanding equity incentive awards and warrants, and proportionate increases were made to the exercise price or share-based performance criteria, if any, applicable to such awards and warrants. Redemption of Series F Preferred Stock On April 17, 2023, the Company convened a special meeting of stockholders, which was adjourned due to the lack of a quorum and reconvened on April 19, 2023 (the “Special Meeting”), at which the Company’s stockholders approved a proposal to amend the Company’s certificate of incorporation to effect a reverse stock split of the Company’s common stock at a ratio in the range of 1-for-2 to 1-for-25, with such ratio to be determined by the Company’s Board of Directors (the “Reverse Split Proposal”). All shares of Series F Preferred Stock that were not present in person or by proxy at the Special Meeting as of immediately prior to the opening of the polls (the “Initial Redemption Time”) were automatically redeemed (the “Initial Redemption”). All outstanding shares of Series F Preferred Stock that were not been redeemed pursuant to an Initial Redemption were redeemed automatically upon the approval by the Company’s stockholders of the Reverse Split Proposal (the “Subsequent Redemption” and, together with the Initial Redemption, the “Redemption”). As of March 31, 2023, there were 79,404 shares of Series F Preferred Stock issued and outstanding. Both the Initial Redemption and the Subsequent Redemption occurred on April 19, 2023. As a result, no shares of Series F Preferred Stock remain outstanding. NASDAQ Notice of Compliance On May 8, 2023, the Company received a notification letter from the Listing Qualifications Department of the Nasdaq Stock Market Inc. (the “Nasdaq”). According to the notification letter, the staff of Nasdaq has determined that for the last 10 consecutive business days, from April 24, 2023 to May 5, 2023, the closing bid price of the Company’s common stock has been at $1.00 per share or greater, and the Company has regained compliance with the minimum bid price requirement set forth in Rule 5550(a)(2) of the Nasdaq Listing Rules.

Note 10 - Subsequent Events

3 Months Ended

Mar. 31, 2023

NOTE 10 – SUBSEQUENT EVENTS

Reverse Stock Split

On April 19, 2023, the Company completed a one-for-twenty reverse stock split that was effective for trading purposes on April 24, 2023. No fractional shares were issued as a result of the reverse stock split. Any fractional shares that would otherwise have resulted from the reverse stock split were rounded up to the next whole number. The number of authorized shares of common stock under the Company’s certificate of incorporation, as amended, remained unchanged at 200,000,000 shares. All numbers of shares and per-share amounts in this report have been adjusted to reflect the reverse split. Proportionate reductions were made to the number of shares of common stock reserved for future issuance under our 2012 Equity Incentive Plan and the number of shares of common stock that may be issued upon exercise or vesting of outstanding equity incentive awards and warrants, and proportionate increases were made to the exercise price or share-based performance criteria, if any, applicable to such awards and warrants.

Redemption of Series F Preferred Stock

On April 17, 2023, the Company convened a special meeting of stockholders, which was adjourned due to the lack of a quorum and reconvened on April 19, 2023 (the “Special Meeting”), at which the Company’s stockholders approved a proposal to amend the Company’s certificate of incorporation to effect a reverse stock split of the Company’s common stock at a ratio in the range of 1-for-2 to 1-for-25, with such ratio to be determined by the Company’s Board of Directors (the “Reverse Split Proposal”). All shares of Series F Preferred Stock that were not present in person or by proxy at the Special Meeting as of immediately prior to the opening of the polls (the “Initial Redemption Time”) were automatically redeemed (the “Initial Redemption”). All outstanding shares of Series F Preferred Stock that were not been redeemed pursuant to an Initial Redemption were redeemed automatically upon the approval by the Company’s stockholders of the Reverse Split Proposal (the “Subsequent Redemption” and, together with the Initial Redemption, the “Redemption”). As of March 31, 2023, there were 79,404 shares of Series F Preferred Stock issued and outstanding. Both the Initial Redemption and the Subsequent Redemption occurred on April 19, 2023. As a result, no shares of Series F Preferred Stock remain outstanding.

NASDAQ Notice of Compliance

On May 8, 2023, the Company received a notification letter from the Listing Qualifications Department of the Nasdaq Stock Market Inc. (the “Nasdaq”). According to the notification letter, the staff of Nasdaq has determined that for the last 10 consecutive business days, from April 24, 2023 to May 5, 2023, the closing bid price of the Company’s common stock has been at $1.00 per share or greater, and the Company has regained compliance with the minimum bid price requirement set forth in Rule 5550(a)(2) of the Nasdaq Listing Rules.