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Note 12 - Common Shares (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Feb. 13, 2019 | Dec. 31, 2018 | Feb. 14, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Feb. 14, 2019 | Mar. 01, 2017 | Feb. 09, 2016
Common Stock, Shares Authorized |  | 250,000,000 |  | 250,000,000 | [1] |  |  |  |
Common Stock, Shares, Outstanding, Ending Balance |  | 10,627,988 |  | 10,583,879 | [1] |  |  |  |
Stock Repurchased and Retired During Period, Shares |  |  |  |  |  | 308,416 |  |  |
Stock Repurchased and Retired During Period, Value |  |  |  |  |  | $ 7,180 |  |  |
Stock Buyback Program 2019 [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount | $ 40,000 |  |  |  |  |  | $ 40,000 |  |
Stock Buyback Program 2018 [Member] |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  | $ 40,000 |  |  |  |  |  |
Stock Buyback Program 2018 [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Shares | 0 |  |  |  |  |  |  |  |
Stock Buyback Program 2017 [Member] |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  | $ 40,000 |
Stock Repurchased and Retired During Period, Shares |  |  | 0 |  |  |  |  |  |
Stock Buyback Program 2016 [Member] |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  |  | $ 40,000
Stock Repurchased and Retired During Period, Shares |  |  |  |  |  | 308,416 |  |  |
Stock Repurchased and Retired During Period, Value |  |  |  |  |  | $ 7,200 |  |  |
[1] | The Company has initially applied ASC 2014-09 (Topic 606) using the modified retrospective method. Under this method, the comparative information is not restated.

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