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Note 20 - Subsequent Events	12 Months Ended
Note 20 - Subsequent Events	Dec. 31, 2020
Notes to Financial Statements
Subsequent Events [Text Block]	NOTE 20. Subsequent Events Since December 31, 2020, the Company has issued 6,654,367 shares of common stock under the Sales Agreement (see Note 1 ) for net proceeds totaling $65.8 million and has issued 830,722 shares of common stock upon the exercise of warrants for cash proceeds totaling $1.6 million. Changes in the status of litigation since December 31, 2020, are included in “Note 11. Commitments and Contingencies—(c) Litigation ”.