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Stockholders' Equity (Details 1) - Equity Incentive Plan [Member] - shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Reserved but unissued shares under the Plan, beginning of year | 266,884 | 455,372
Increases in the number of authorized shares under the Plan | 255,261 | 15,039
Grants of stock options | (127,000) | (171,900)
Stock option forfeitures | 15,955 | 12,485
Exercise of stock options | 0 | 0
Stock grants | (219,444) | (44,112)
Reserved but unissued shares under the Plan, end of year | 191,656 | 266,884

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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + 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 (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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