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Note 14 - Stockholders' Equity (Details Textual) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Feb. 09, 2021 | Feb. 13, 2020 | Feb. 12, 2020 | Feb. 14, 2019 | Feb. 13, 2019
Stock Buyback Program 2021 [Member] |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  | $ 40.0 |  |  |  |
Stock Repurchased and Retired During Period, Shares (in shares) |  | 0 |  |  |  |  |  |
Stock Buyback Program 2020 [Member] |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  | $ 40.0 | $ 40.0 |  |
Stock Repurchased and Retired During Period, Shares (in shares) | 3,500 | 0 | 70,238 |  |  |  |  |
Stock Repurchased and Retired During Period, Value | $ 0.2 |  | $ 3.3 |  |  |  |  |
Stock Buyback Program 2019 [Member] |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  | $ 40.0 | $ 40.0
Stock Repurchased and Retired During Period, Shares (in shares) |  |  | 0 |  |  |  |  |

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