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Capital Stock (Details Textual) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2011
Common Stock, Shares Authorized | 75,000,000 | 75,000,000 |
Preferred Stock, Shares Authorized | 5,000,000 | 5,000,000 |
Common Stock, Capital Shares Reserved for Future Issuance | 5,352,000 |  |
Treasury Stock, Shares, Acquired | 137,000 |  |
Stockholder Rights Exercisable Description | Person becomes an Acquiring Person (unless such Person acquires 50 percent or more of the common stock of the Company then outstanding, as more fully described in the Rights Agreement), the Board of Directors may exchange one share of the Company’s common stock for each outstanding Right (other than rights owned by such Person, which would have become void). In addition, if the Company is acquired in a merger or other business combination transaction after a Person becomes an Acquiring Person, all holders of Rights, except the Acquiring Person, may purchase at the Right’s then-current exercise price, a number of the acquiring Company’s common stock having a market value of twice the exercise price. If the Company receives a “qualifying offer” (which includes certain all-cash fully financed tender offers or exchange offers for all of the Company’s outstanding common stock), under certain circumstances, holders of 10 percent of the Company’s outstanding common stock (excluding stock held by the offeror and its affiliates and associates) may direct the Board of Directors to call a special meeting of stockholders to consider a resolution exempting such “qualifying offer” from the Rights Agreement. The Rights themselves have no voting power. The Board of Directors may redeem the Rights at an initial redemption price of $0.001 per Right under certain circumstances set forth in the Rights Agreement. |  |
Stockholders Rights Agreement [Member] |  |  |
Equity Method Investment, Ownership Percentage | 20.00% |  |
Director [Member] |  |  |
Stock Repurchase Program, Authorized Amount |  |  | $ 2.0

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