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Note 14 - Net Income Per Common Share (Details Textual) |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Mar. 05, 2021 | Sep. 30, 2021 | Sep. 30, 2021
The 2026 Notes and the 2028 Notes [Member] |  |  |
Debt Instrument, Convertible, Conversion Ratio | 0.4394 | 0.4394 | 0.4394

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