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Note 13 - Common Shares (Details Textual) - USD ($) $ / shares in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Feb. 13, 2020 | Feb. 12, 2020 | Dec. 31, 2019 | Feb. 13, 2019 | Dec. 31, 2018 | Feb. 14, 2018 | Dec. 31, 2017 | Mar. 01, 2017
Common Stock, Shares Authorized |  |  | 250,000,000 |  | 250,000,000 | [1] |  |  |
Common Stock, Shares, Outstanding, Ending Balance |  |  | 10,585,159 |  | 10,627,988 | [1] |  |  |
Stock Repurchased and Retired During Period, Shares |  |  | 101,816 |  |  |  |  |  |
Stock Repurchased and Retired During Period, Value |  |  | $ 4,986 |  |  |  |  |  |
Common Stock, No Par Value |  |  | $ 0 |  | $ 0 | [1] |  |  |
Stock Buyback Program 2020 [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  | $ 40,000 |  |  |  |  |  |  |
Stock Buyback Program 2019 [Member] |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  | $ 40,000 |  |  |  |  |
Stock Buyback Program 2019 [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Shares | 101,816 | 101,816 |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Value | $ 5,000 | $ 5,000 |  |  |  |  |  |  |
Stock Buyback Program 2018 [Member] |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  | $ 40,000 |  |
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 |  |
[1] | The Company has initially applied ASC 2016-02 (Topic 842) on January 1, 2019 using the modified retrospective method (note 2(v)). Under this method, the comparative information is not restated.

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