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Shareholders' Equity - Repurchase Plan (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Oct. 30, 2015	Dec. 03, 2013
Stock-Based Compensation:
Stock-based compensation expense	$ 353,000	$ 403,000
Stock Repurchase Plans
Repurchase of common stock, authorized			$ 5,000,000	$ 5,000,000
Repurchase of common stock, net	$ 1,762,000	$ 2,450,000
Common Stock
Stock Repurchase Plans
Repurchase of common stock, shares	664,000	787,000
Repurchase of common stock, net	$ 7,000	$ 8,000
Employee Stock Purchase Plan
Stock-Based Compensation:
Maximum percent of base compensation contributed towards purchase of shares	10.00%
Percent of market value for employee purchases	85.00%
Employees purchased shares	18,000	27,000
Shares are reserved for future employee purchases	134,000
Stock-based compensation expense	$ 16,000	$ 26,000

X

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

Aggregate number of common shares reserved for future issuance.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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- Definition

The number of shares purchased on the open market during the period for issuance to employees under the plan.

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Purchase price of common stock expressed as a percentage of its fair value.

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Amount of stock repurchase plan authorized.

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- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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