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Note 4 - Share Repurchase Program (Details) - USD ($) $ in Thousands | 12 Months Ended | 25 Months Ended
--- | --- | ---
Dec. 31, 2015 | May. 01, 2015 | Dec. 31, 2014 | Jun. 02, 2016
Stockholders' Equity Note [Abstract] |  |  |  |
Stock repurchase plan - shares authorized to be repurchased |  | 1,800,000 |  | 3,400,000
Total shares repurchased | 2,258,929 |  | 227,974 |
Cost of shares repurchased | $ 9,388 |  | $ 762 |
Shares repurchased under share repurchase plan | 2,225,437 |  | 216,754 |
Shares repurchased under share repurchase plan - value | $ 9,228 |  | $ 722 |

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