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Stockholders' Equity (Details 7) - Consultant Plan [Member] - shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Reserved but unissued shares under the Plan, beginning of year 83,633 92,130
Increases in the number of authorized shares under the Consultant Plan 25,526 1,503
Stock grants (10,000) (10,000)
Reserved but unissued shares under the Plan, end of year 99,159 83,633