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Note 13 - Stockholders' Equity (Details Textual) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Feb. 14, 2018 | Mar. 01, 2017 | Feb. 09, 2016
Stock Buyback Program 2018 [Member] |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  | $ 40 |  |
Stock Repurchased and Retired During Period, Shares | 0 |  | 0 |  |  |  |
Stock Buyback Program 2017 [Member] |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  | $ 40 |
Stock Repurchased and Retired During Period, Shares |  | 0 | 0 | 0 |  |  |
Stock Buyback Program 2016 [Member] |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  | $ 40
Stock Repurchased and Retired During Period, Shares |  |  |  | 0 |  |  |

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