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Stockholders' Equity (Details 1) - Equity Incentive Plan [Member] - shares
 12 Months Ended
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