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Purchase of interest in Aerex Industries, Inc. (Details Textual) - USD ($) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 11, 2016 | Oct. 31, 2017 | Dec. 31, 2017 | Sep. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Feb. 28, 2017
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Notes Payable, Related Parties, Current |  |  | $ 686,000 |  | $ 686,000 | $ 490,000 |  |
Goodwill, Impairment Loss |  |  |  |  | 1,400,000 | 1,750,000 | $ 0 |
Aerex Industries Inc [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill, Impairment Loss |  |  | $ 1,400,000 | $ 1,750,000 | $ 1,400,000 | $ 1,750,000 |  |
Business Acquisition, Percentage of Voting Interests Acquired | 51.00% |  |  |  |  |  |  |
Business Combination, Consideration Transferred | $ 7,700,000 |  |  |  |  |  |  |
Aerex Industries Inc [Member] | Thomas Donnick, Jr [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners | 49.00% |  |  |  |  |  |  |
Shareholders Agreement [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Notes Payable, Related Parties, Current | $ 510,000 |  |  |  |  |  |  | $ 408,000
Debt Instrument, Maturity Date | Sep. 30, 2017 |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.04% |  | 1.00% |  | 1.00% |  |  |
Notes Payable, Current |  | $ 1,400,000 |  |  |  |  |  |
Debt Instrument, Maturity Date, Description |  | the term of the notes payable issued in February 2017 for an additional six months with a new maturity date of March 31, 2018. |  |  |  |  |  |
Shareholders Agreement [Member] | Donnick [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Notes Payable, Related Parties, Current | $ 490,000 | $ 306,000 |  |  |  |  |  |
Shareholders Agreement [Member] | Former Sole Shareholder [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Notes Payable, Related Parties, Current | $ 392,000 | $ 294,000 |  |  |  |  |  |

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