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Basis of presentation, summary of significant accounting policies (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Cash and cash equivalents | $ 5,258,000 |  |
Working capital | 8,915,000 |  |
Stockholders' equity | 42,651,677 |  | $ 48,869,304
Accumulated deficit | (155,613,572) |  | (139,263,480)
Deferred tax liability | 706,709 |  | $ 699,000
Income tax benefit | $ 3,053,000 |  |
BDI [Member] |  |  |
Percentage of consolidated subsidiaries | 100.00% |  |
Tess Inc [Member] |  |  |
Percentage of consolidated subsidiaries | 52.00% |  |
Kairos Global Technology, Inc [Member] |  |  |
Percentage of consolidated subsidiaries | 100.00% |  |
Digital Green Energy Corp., Inc. [Member] |  |  |
Percentage of consolidated subsidiaries | 100.00% |  |
Logical Brokerage Corp [Member] |  |  |
Percentage of consolidated subsidiaries | 92.50% |  |
Deferred tax liability | $ 200,000 |  |
Prive Technologies, Inc. [Member] |  |  |
Deferred tax liability | $ 2,900,000 |  |

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