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Stockholders' Equity (Details) - Equity Incentive Plan [Member] - shares
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Reserved but unissued shares under the Plan, beginning of year 191,656 266,884
Increases in the number of authorized shares under the Plan 1,106,088 255,261
Grants of stock options (224,000) (127,000)
Stock option forfeitures 337,583 15,955
Exercise of stock options 0 0
Stock grants (114,865) (219,444)
Stock grant forfeitures 0 0
Reserved but unissued shares under the Plan, end of year 1,296,462 191,656