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Note 15 - Subsequent Events	6 Months Ended
Note 15 - Subsequent Events	Jun. 30, 2020
Notes to Financial Statements
Subsequent Events [Text Block]	NOTE 15 . Subsequent Events On July 13, 2020, the Company completed the sale of 12,503,806 shares for gross proceeds of approximately $100 million from an at-the-market facility (the “ATM Program”) under a sales prospectus agreement dated July 8, 2020. After deducting sales commissions and expenses, net cash proceeds under the ATM Program were approximately $97 million. Since June 30, 2020, the Company has issued 531,013 shares of common stock upon the exercise of warrants for cash proceeds totaling $1.2 million.