Note 11 - Subsequent Events	3 Months Ended
Mar. 31, 2023
Notes to Financial Statements
Subsequent Events [Text Block]	Note 11 – Subsequent Events April 2023 Public Offering On April 20, 2023, we entered into the April 2023 Offering of an aggregate of 3,686,006 units with each unit consisting of one share of common stock and the April 2023 Warrants. The April 2023 Warrants are immediately exercisable for shares of common stock at a price of $2.93 per share and expire five years from the date of issuance. The shares of common stock and the April 2023 Warrants were immediately separable and were issued separately in the April 2023 Offering. In addition, Ladenburg exercised in full the Overallotment Option to purchase up to 552,900 additional shares of common stock and/or warrants to purchase up to 552,900 additional shares of common stock. The closing of the April 2023 Offering occurred on April 24, 2023, inclusive of the Overallotment Option. The offering price to the public was $2.93 per unit. After deducting underwriting discounts and commissions and other estimated offering expenses payable by us, and excluding the proceeds, if any, from the exercise of the April 2023 Warrants issued pursuant to this April 2023 Offering, the net proceeds to us were approximately $10.8 million.

Note 11 - Subsequent Events

3 Months Ended

Mar. 31, 2023

Note 11 – Subsequent Events

April 2023 Public Offering

On April 20, 2023, we entered into the April 2023 Offering of an aggregate of 3,686,006 units with each unit consisting of one share of common stock and the April 2023 Warrants. The April 2023 Warrants are immediately exercisable for shares of common stock at a price of $2.93 per share and expire five years from the date of issuance. The shares of common stock and the April 2023 Warrants were immediately separable and were issued separately in the April 2023 Offering.

In addition, Ladenburg exercised in full the Overallotment Option to purchase up to 552,900 additional shares of common stock and/or warrants to purchase up to 552,900 additional shares of common stock.

The closing of the April 2023 Offering occurred on April 24, 2023, inclusive of the Overallotment Option. The offering price to the public was $2.93 per unit. After deducting underwriting discounts and commissions and other estimated offering expenses payable by us, and excluding the proceeds, if any, from the exercise of the April 2023 Warrants issued pursuant to this April 2023 Offering, the net proceeds to us were approximately $10.8 million.