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Accounting policies (Details Textual) - USD ($)	3 Months Ended	12 Months Ended
Accounting policies (Details Textual) - USD ($)	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Feb. 11, 2016
Accounting Policies [Line Items]
Foreign Currency Transaction Gain (Loss), before Tax		$ 50,299	$ (485,291)	$ (111,409)
Cash Deposits In Excess Of Federally Insured Limits		2,000,000
Accumulated Amortization of Other Deferred Costs		$ 1,800,000	1,600,000
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		$ 37,754,409	27,871,149
Cash And Restricted Cash Equivalents Held In Foreign Bank		40,000,000
Goodwill		9,784,248	3,499,037
Goodwill, Impairment Loss		$ 1,750,000	0	$ 0
Aerex Industries Inc [Member]
Accounting Policies [Line Items]
Estimated Fair Value Carrying Amount Exceeded Percentage		26.00%
Business Acquisition, Percentage of Voting Interests Acquired					51.00%
Goodwill	$ 6,285,211				$ 8,035,211
Goodwill, Impairment Loss	$ 1,750,000
Certificates of Deposit [Member]
Accounting Policies [Line Items]
Cash Equivalents, at Carrying Value		$ 1,000,000	$ 13,600,000
BELIZE
Accounting Policies [Line Items]
Deposits held in foreign bank		4,900,000
BAHAMAS
Accounting Policies [Line Items]
Deposits held in foreign bank		$ 5,900,000
Retail [Member]
Accounting Policies [Line Items]
Estimated Fair Value Carrying Amount Exceeded Percentage		123.00%	72.00%
Goodwill		$ 1,170,511	$ 1,170,511
Goodwill, Impairment Loss		$ 0
Bulk [Member]
Accounting Policies [Line Items]
Estimated Fair Value Carrying Amount Exceeded Percentage		41.00%	20.00%
Goodwill		$ 2,328,526	$ 2,328,526
Goodwill, Impairment Loss		0
Capitalized Engineering Labor and Materials Cost [Member]
Accounting Policies [Line Items]
Other Assets		$ 3,500,000	$ 3,500,000