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Stock Repurchase Plan (Details Textual) - Stock repurchase plan [Member] - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Nov. 30, 2003
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Stock repurchase plan (Details Textual) |  |  |  |
Authorized common stock for repurchases, amount |  |  |  | $ 15.0
Remaining authorized share for repurchases, amount | $ 70.0 | $ 70.0 | $ 70.0 |

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- References No definition available. + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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- Details
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