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Note 15 - Common Shares (Details Textual) - USD ($) $ in Millions | 12 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Feb. 23, 2024 | Feb. 22, 2024 | Feb. 09, 2024 | Feb. 10, 2023 | Feb. 09, 2023 | Feb. 10, 2022 | Feb. 09, 2021 | Feb. 12, 2020
Common Stock, Shares Authorized (in shares) | 250,000,000 | 250,000,000 |  |  |  |  |  |  |  |  |  |
Common Stock, Shares, Outstanding (in shares) | 10,903,405 | 10,817,110 |  |  |  |  |  |  |  |  |  |
Stock Buyback Program 2024 [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  | $ 40 | $ 40 |  |  |  |  |  |
Stock Buyback Program 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  | $ 40 | $ 40 |  |  |
Stock Repurchased and Retired During Period, Shares (in shares) | 0 |  |  |  |  |  |  |  |  |  |  |
Stock Buyback Program 2023 [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  | $ 40 |  |  |  |  |
Stock Buyback Program 2022 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  |  |  | $ 40 |  |
Stock Repurchased and Retired During Period, Shares (in shares) |  | 0 |  |  |  |  |  |  |  |  |  |
Stock Buyback Program 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  |  |  |  | $ 40 |
Stock Repurchased and Retired During Period, Shares (in shares) |  |  | 0 |  |  |  |  |  |  |  |  |
Stock Buyback Program 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  |  |  |  |  | $ 40
Stock Buyback Program 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Shares (in shares) |  |  |  | 0 |  |  |  |  |  |  |  |

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