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Acquisition (Details Textual) - USD ($) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Jan. 02, 2019 | Jan. 31, 2020 | Nov. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Acquisitions (Textual) |  |  |  |  |  |  |
Recorded revenue |  |  |  | $ 3,300,000 |  |  |
Description of acquired entity |  |  | the Company acquired an additional 9.0% interest in Lumo for $0.2 million, increasing its aggregate ownership to 89.0%. In January 2020, Lumo paid off half of the secured loan to GREI in exchange for additional shares which resulted in GREI's interest in Lumo increasing to 92.5%. |  |  |  |
Lumo Energia Oyj [Member] |  |  |  |  |  |  |
Acquisitions (Textual) |  |  |  |  |  |  |
Aggregate cash payment | $ 1,869,000 |  |  |  |  |  |
Percentage of acquire controlling interest |  | 7.50% |  |  |  |  |
Total consideration, net of cash acquired | 3,391,000 |  |  |  |  |  |
Recorded revenue |  |  |  |  | $ 2,800 | $ 8,200 | $ 7,600
Short-term debts | $ 2,260,000 |  |  |  |  |  |
Acquisition of purchase agreement | The Company completed the purchase of an 80% controlling interest in Lumo Energia Oyj ("Lumo"), a Finnish public limited company. The Company paid the sellers a total of €1.6 million (equivalent to $1.9 million). The Company contributed €1.3 million (equivalent to $1.5 million) as a capital loan to fund Lumo's working capital requirements. The Company also provided Lumo with a secured loan for €2.0 million (equivalent to $2.3 million) to pay off and replace its remaining debt. The secured loan is payable in 4 years and bears interest at annual rate of 4.0%, payable monthly. The Company also issued 176,104 shares of its Class B common stock to certain of the sellers which are subject to restrictions as described in the agreement (the “ Lumo Restricted Shares”). The Lumo Restricted Shares are subject to vesting conditions related to employment and services to be provided by the recipients of up to three years. The Lumo Restricted Shares are accounted for as a share-based compensation and is amortized to the consolidated statement of income over the vesting period of three years |  |  |  |  |  |
Lumo Energia Oyj [Member] | Three Annual Installment [Member] |  |  |  |  |  |  |
Acquisitions (Textual) |  |  |  |  |  |  |
Vesting interest rate |  | 33.30% |  |  |  |  |
Trademark [Member] | Lumo Energia Oyj [Member] |  |  |  |  |  |  |
Acquisitions (Textual) |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 5 years |  |  |  |  |  |
Non Compete Agreements [Member] | Lumo Energia Oyj [Member] |  |  |  |  |  |  |
Acquisitions (Textual) |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 3 years |  |  |  |  |  |
Customer Relationships [Member] | Lumo Energia Oyj [Member] |  |  |  |  |  |  |
Acquisitions (Textual) |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 2 years |  |  |  |  |  |

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