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Accounting policies (Details Textual) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Accounting Policies [Line Items] |  |  |  |  |
Foreign Currency Transaction Gain (Loss), before Tax | $ 73,267 | $ (5,612) | $ 31,525 | $ 164,339 |
Maximum [Member] |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Percentage Of Bad Debts |  |  | 1.00% |  | 1.00%
Aerex Industries Inc [Member] |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired | 51.00% |  | 51.00% |  |
Certificates of Deposit [Member] |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Cash Equivalents, at Carrying Value | $ 6,400,000 |  | $ 6,400,000 |  | $ 15,900,000
BELIZE |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Deposits held in foreign bank | 3,100,000 |  | 3,100,000 |  |
BAHAMAS |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Deposits held in foreign bank | $ 3,900,000 |  | $ 3,900,000 |  |

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