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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
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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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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