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Accounting policies (Details Textual) - USD ($)	3 Months Ended		12 Months Ended
	Dec. 31, 2017	Sep. 30, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Feb. 11, 2016
Accounting Policies [Line Items]
Foreign Currency Transaction Gain (Loss), before Tax			$ 69,630	$ 50,299	$ (485,291)
Cash, Uninsured Amount	$ 2,700,000		2,700,000
Impairment of goodwill			1,400,000	1,750,000	0
Accumulated Amortization of Other Deferred Costs	2,000,000		$ 2,000,000	1,800,000
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		$ 16,388,030	1,499,707
Cash And Restricted Cash Equivalents Held In Foreign Bank	43,800,000		43,800,000
Goodwill	8,384,248		8,384,248	9,784,248
Amortization of Other Deferred Charges			179,353	179,353	$ 179,353
Aerex Industries Inc [Member]
Accounting Policies [Line Items]
Impairment of goodwill	1,400,000	$ 1,750,000	1,400,000	1,750,000
Business Acquisition, Percentage of Voting Interests Acquired						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		15,900,000	$ 1,000,000
BELIZE
Accounting Policies [Line Items]
Deposits held in foreign bank	6,300,000		6,300,000
BAHAMAS
Accounting Policies [Line Items]
Deposits held in foreign bank	14,300,000		$ 14,300,000
Retail [Member]
Accounting Policies [Line Items]
Estimated Fair Value Carrying Amount Exceeded Percentage			121.00%	123.00%
Goodwill	1,170,511		$ 1,170,511	$ 1,170,511
Bulk [Member]
Accounting Policies [Line Items]
Estimated Fair Value Carrying Amount Exceeded Percentage			59.00%	41.00%
Goodwill	2,328,526		$ 2,328,526	$ 2,328,526
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			12.00%	26.00%
Goodwill	$ 4,885,211		$ 4,885,211	$ 6,285,211

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