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Accounting policies (Details Textual) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Foreign Currency Transaction Gain (Loss), before Tax [Abstract] |  |  |
Foreign Currency Transaction Gain (Loss), before Tax | $ 57,701 | $ 103,555 |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] |  |  |
Restricted Cash, Current | 1,500,000 |  | $ 0
Standby Letters of Credit [Member] |  |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] |  |  |
Long-term Line of Credit | $ 1,500,000 |  |
Maximum [Member] |  |  |
Revenue Recognition [Abstract] |  |  |
Percentage of Bad Debts |  |  | 1.00%
Aerex Industries Inc [Member] |  |  |
Revenue Recognition [Abstract] |  |  |
Business Acquisition, Percentage of Voting Interests Acquired | 51.00% |  |
Certificates of Deposit [Member] |  |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] |  |  |
Cash Equivalents, at Carrying Value | $ 15,200,000 |  | $ 8,400,000
BAHAMAS |  |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] |  |  |
Deposits held in foreign bank | $ 7,600,000 |  |

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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