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Note 1 - Organization and Significant Accounting Policies - Summary of Earnings (Loss) Per Share (Details) - shares | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Basic weighted-average shares (in shares) | 30,289,000 | 29,585,000
Conversion of unsecured loan notes (in shares) | 0 | 0
Unexercised options and unvested restricted stock units (in shares) | 0 | 109,000
Diluted weighted-average shares (in shares) | 30,289,000 | 29,694,000

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