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Note 4 - Common Stock | 12 Months Ended
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Dec. 31, 2022
Notes to Financial Statements |
Stockholders' Equity Note Disclosure [Text Block] | 4. COMMON STOCK At December 31, 2022 and 2021, respectively, we had 31,272,303 and 31,227,300 shares of common stock issued and 30,296,297 and 30,263,791 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, 2022, we had 5,600,676 shares reserved for issuance upon the exercise or vesting of equity awards, of which 384,500 are stock options that are currently exercisable (see Note 8).

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