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Accounting policies (Details Textual) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 | Sep. 30, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Feb. 11, 2016
Accounting Policies [Line Items] |  |  |  |  |
Foreign Currency Transaction Gain (Loss), before Tax |  |  | $ 8,089 | $ 73,635 |
Cash, Uninsured Amount |  |  | 2,700,000 |  |
Impairment of goodwill |  |  | 0 | 1,400,000 |
Accumulated Amortization of Other Deferred Costs | $ 2,000,000 |  | $ 2,200,000 | 2,000,000 |
Equity Method Investment, Additional Information |  |  | The Company uses the equity method of accounting for investments in common stock where the Company holds 20% to 50​​​​​​​% of the voting stock of the investee and has significant influence over its operating and financial policies but does not meet the criteria for consolidation. |  |
Criteria For Recognizing Investment At Cost |  |  | Investments where the Company does not exercise significant influence over the operating and financial policies of the investee and holds less than 20% of the voting stock are recorded at cost​​​​​​​. |  |
Cash Equivalents, at Carrying Value | 16,388,030 |  | $ 9,419,179 | 16,388,030 |
Cash And Restricted Cash Equivalents Held In Foreign Bank |  |  | 28,900,000 |  |
Goodwill | 8,003,568 |  | 8,003,568 | 8,003,568 |
Amortization of Other Deferred Charges |  |  | 179,353 | 179,353 |
Disposal Group, Including Discontinued Operation, Goodwill, Noncurrent | 380,680 |  | 380,680 | 380,680 |
Cw Belize [Member] |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Disposal Group, Including Discontinued Operation, Goodwill, Noncurrent | 381,000 |  | $ 381,000 | 381,000 |
Maximum [Member] |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Percentage Of Bad Debts |  |  | 1.00% |  |
Aerex Industries Inc [Member] |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Impairment of goodwill | 1,400,000 | $ 1,750,000 |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  | 51.00% |  | 51.00%
Goodwill | 4,885,211 | $ 6,285,211 |  | 4,885,211 | $ 8,035,211
Certificates of Deposit [Member] |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Cash Equivalents, at Carrying Value | 15,900,000 |  | $ 8,400,000 | $ 15,900,000 |
BAHAMAS |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Deposits held in foreign bank |  |  | $ 4,300,000 |  |
Retail [Member] |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Estimated Fair Value Carrying Amount Exceeded Percentage |  |  | 79.00% | 121.00% |
Goodwill | 1,170,511 |  | $ 1,170,511 | $ 1,170,511 |
Bulk [Member] |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Estimated Fair Value Carrying Amount Exceeded Percentage |  |  | 62.00% | 59.00% |
Goodwill | 1,947,846 |  | $ 1,947,846 | $ 1,947,846 |
Capitalized Engineering Labor and Materials Cost [Member] |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Other Assets | 3,500,000 |  | $ 3,500,000 | $ 3,500,000 |
Manufacturing Units [Member] |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Estimated Fair Value Carrying Amount Exceeded Percentage |  |  | 53.00% | 12.00% |
Goodwill | $ 4,885,211 |  | $ 4,885,211 | $ 4,885,211 |

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