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Basis of presentation, summary of significant accounting policies (Schedule of Deferred Tax Liability) (Details) - USD ($) | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Deferred tax liability as of January 1, 2018 | $ 699,000 |
Deferred tax liability recorded on the Prive acquisition | 2,918,000 |
Deferred tax liability recorded on the Logical Brokerage acquisition | 142,709 |
Impairment and depreciation on Prive and Kairos acquisitions | (3,053,000) |
Deferred tax liability as of March 31, 2018 | $ 706,709 |

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