Shareholders' Equity (Schedule of Activity in Options and Warrants) (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Number of Shares Underlying Warrants and Options
Exercised	(64,800)	(179,983)
Employee Stock Option [Member]
Number of Shares Underlying Warrants and Options
Balance	1,480,599	1,117,899	1,269,649
Granted/Issued	209,750	499,700
Cancelled/Terminated	(104,750)	(64,500)	(151,750)
Exercised	(14,800)	(72,500)
Balance	1,570,799	1,480,599	1,117,899	1,269,649
Weighted Average Exercise Price
Balance	$ 7.80	$ 9.03	$ 11.64
Granted/Issued	$ 5.19	$ 5.26
Cancelled/Terminated	$ 7.83	$ 12.81	$ 12.76
Exercised	$ 5.56	$ 4.83
Balance	$ 7.49	$ 7.80	$ 9.03	$ 11.64
Weighted Average Remaining Contractual Term (Years)	5 years 2 months 12 days	5 years 2 months 12 days	3 years 8 months 12 days	4 years 2 months 12 days
Aggregate Intrinsic Value	$ 199,000
Non-Employee Stock Options and Warrants [Member]
Number of Shares Underlying Warrants and Options
Balance	1,379,620	1,512,103	704,257
Granted/Issued	24,000		807,846
Cancelled/Terminated		(25,000)
Exercised	(50,000)	(107,483)
Balance	1,353,620	1,379,620	1,512,103
Weighted Average Exercise Price
Balance	$ 5.58	$ 5.56
Granted/Issued	$ 6.58		$ 5.12
Cancelled/Terminated		$ 9.00
Exercised	$ 4.45	$ 4.45
Balance	$ 5.64	$ 5.58	$ 5.56
Non-Employee Stock Options and Warrants [Member] \| Minimum [Member]
Weighted Average Exercise Price
Balance				$ 5.00
Non-Employee Stock Options and Warrants [Member] \| Maximum [Member]
Weighted Average Exercise Price
Balance				$ 9.00

Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(4)

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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