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Stockholders' Equity (Details) - shares | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Grants of stock options | (20,000) | (26,000)
Equity Incentive Plan [Member] |  |
Reserved but unissued shares under the Plan, beginning of year | 455,372 | 242,764
Increases in the number of authorized shares under the Plan | 15,039 | 315,225
Grants of stock options | (171,900) | (409,200)
Stock option forfeitures | 12,485 | 116,780
Exercise of stock options | 0 | 212,837
Stock grants | (44,112) | (23,034)
Reserved but unissued shares under the Plan, end of year | 266,884 | 455,372

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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=6415400&loc=d3e5070-113901 + Details
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