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Note 5 - Income Per Common Share (Details Textual) - shares | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements (in shares) | 1,954,773 | 2,863,038
Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants (in shares) | 1,506,950 | 1,536,615
Incremental Common Shares Attributable to Dilutive Effect of Deferred Shares (in shares) | 2,109,056 | 2,026,440

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