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Note 4 - Common Stock | 12 Months Ended
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Dec. 31, 2021
Notes to Financial Statements |
Stockholders' Equity Note Disclosure [Text Block] | 4. COMMON STOCK At December 31, 2021 and 2020, respectively, we had 31,227,300 and 25,639,702 shares of common stock issued and 30,263,791 and 25,228,951 outstanding, with an additional 6,715 shares reserved for issuance upon conversion of the nil coupon non-redeemable convertible unsecured loan notes (see Note 6). As of December 31, 2021, we had 5,600,676 shares reserved for issuance upon the exercise or vesting of equity awards, of which 434,500 are stock options that are currently exercisable (see Note 8).

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