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Consolidated Statements of Stockholders' Equity (Deficit) (Unaudited) (Parentheticals) - shares | 3 Months Ended
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Jun. 30, 2020 | Mar. 31, 2020 | Mar. 31, 2019
Common Stock [Member] |  |  |
Employee stock purchase plan sales, shares (in shares) |  | 110,000 | 47,000
Exercise of stock options, shares (in shares) |  |  | 160,000
Exercise of stock options, shares (in shares) | 193,000 |  |
Issuance of common stock, shares (in shares) | 22,044,000 |  |
Warrants issued (in shares) | 3,511,000 |  |

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