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Notes Payable - Additional Information (Details) - USD ($) |  |  | 6 Months Ended
--- | --- | --- | ---
May 07, 2020 | Nov. 03, 2015 | Jun. 30, 2020 | Jun. 30, 2019
Proceeds from PPP Loan | $ 332,000 |  | $ 332,000 | $ 0
Green Bank |  |  |  |
Principle amount |  | $ 10,000,000 |  |
Term of the loan |  | 21 years |  |
Debt service coverage ratio |  | 1.25 |  |
Net worth ratio |  | 1.0 |  |
Minimum current ratio |  | 1.5 |  |
Collateral amount of loan |  | $ 1,000,000 |  |
Loan guarantee |  |  | 90.00% |
Guarantee fee |  |  | $ 270,000 |
Annual fee |  |  | 0.50% |
Green Bank | Maximum |  |  |  |
Interest rate |  | 6.00% |  |
Green Bank | Minimum |  |  |  |
Interest rate |  | 2.00% |  |

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