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Stockholders' Equity (Details 4) - Employee Stock Option [Member] - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Class of Stock [Line Items]
Non-vested stock options at January 1	335,283	466,009
Granted - Number of Options	127,000	171,900
Vested - Number of Options	(207,457)	(290,141)
Exercised - Number of Options	0	0
Forfeited/Expired/Exchanged - Number of Options	(15,955)	(12,485)
Non-vested stock options at December 31	238,871	335,283
Non-vested stock options - Weighted Average Grant Date Fair Value	$ 5.09	$ 5.79
Granted - Weighted Average Grant Date Fair Value	3.69	4.22
Vested - Weighted Average Grant Date Fair Value	5.16	5.67
Exercised - Weighted Average Grant Date Fair Value	0	0
Forfeited/Expired/Exchanged - Weighted Average Grant Date Fair Value	5.15	6.17
Non-vested stock options - Weighted Average Grant Date Fair Value	$ 4.27	$ 5.09

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- Definition

The weighted average fair value at grant date of nonvested stock options exercised during the period.

+ References

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Number of non vested options exercised during the period.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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Number of non-vested options outstanding.

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