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Note 6 - (Loss) Income Per Common Share (Details Textual) - shares | 3 Months Ended | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2021
Incremental Common Shares Attributable to Share-based Payment Arrangements, Total (in shares) | 2,499,956 | 2,496,622
Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants (in shares) | 1,454,246 | 1,578,293
Incremental Common Shares Attributable to Dilutive Effect of Deferred Shares (in shares) | 1,996,112 | 2,152,578

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