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Note 13 - Stockholders' Equity (Details Textual) - USD ($) shares in Thousands, $ in Millions | 3 Months Ended | 18 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2023 | Jun. 30, 2022 | Sep. 30, 2022 | Feb. 10, 2023 | Feb. 09, 2023 | Feb. 10, 2022 | Feb. 09, 2021
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 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 |  |  |  |

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