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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 No definition available. + Details
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- Definition Number of non vested options exercised during the period. + References No definition available. + Details
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- Definition Number of non vested options granted during the period. + References No definition available. + Details
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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 + Details
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- Definition Number of non-vested options outstanding. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of non-vested options forfeited. + References No definition available. + Details
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- Details
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