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Note 5 - Income (Loss) Per Common Share (Details Textual) - shares | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2021
Incremental Common Shares Attributable to Share-based Payment Arrangements, Total (in shares) | 2,960,950 | 2,923,515
Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants (in shares) | 1,635,675 | 1,591,935
Incremental Common Shares Attributable to Dilutive Effect of Deferred Shares (in shares) | 2,134,009 | 2,134,009

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