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Stock based compensation, options and warrants (Schedule of Recognized Stock-based Compensation) (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total stock-based compensation | $ 115,026 | $ 1,608,086 | $ 350,068 | $ 2,492,029
Restricted Stock [Member] |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total stock-based compensation | 115,026 | 1,432,593 | 291,570 | 2,199,542
Stock options awards under the Plan [Member] |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total stock-based compensation |  | $ 175,493 | $ 58,498 | $ 292,487

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