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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