Common Stock and Stock Options (Details Textual) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended | |
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit (in dollars per share) | | | $ 0.84 | | | |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit (in dollars per share) | | | $ 6 | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term | | | 3 years 3 months 18 days | | | |
Share-based Compensation, Total | $ 50,669 | $ 51,532 | $ 97,531 | $ 105,103 | | |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $ 80,120 | | $ 80,120 | | | |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price | $ 4.39 | | $ 4.39 | | | |
Proceeds from Stock Options Exercised | | | $ 0 | $ 4,200 | | |
Common Stock [Member] | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | |
Stock Issued During Period, Shares, New Issues (in shares) | | | 44,623 | 31,682 | | |
Stock Issued During Period, Value, New Issues | | | $ 37,486 | $ 24,358 | | |
Employee Stock Option [Member] | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance | 397,671 | | 397,671 | | 397,671 | 572,857 |
Proceeds from Stock Options Exercised | | $ 4,200 | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | | 5,000 | | | 5,000 | |
Non Employee Director Stock Options [Member] | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance | 0 | 0 | 0 | 0 | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | | | 0 | 0 | | |