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COMMITMENTS AND CONTINGENT LIABILITIES - Additional Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2019 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Apr. 30, 2019
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  | $ 1,000,000,000
Operating lease expense | $ 114,112 | $ 128,175 | $ 128,175 | $ 256,350 | $ 370,462 | $ 925,217 |  |  |
Standby letters of credit drawn |  |  | 45,000,000 | 321,000,000 | 327,000,000 | 327,000,000 | $ 39,500,000 | $ 0 |
Surety Bond |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Issued surety bonds | 500,438 | 500,438 |  | 500,438 | 500,438 | 500,438 |  |  |
Surety bonds renewal amount | 400,000 | 400,000 |  | 400,000 | 400,000 | 400,000 |  |  |
Surety bonds renewal amount, not applicable |  |  |  | $ 100,438 | $ 100,438 | $ 100,438 |  |  |
Extended term for surety bonds (in years) |  |  |  | 1 year | 1 year | 1 year |  |  |
Standby Letters of Credit |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | 250,000 |  |  |  |  |  |
Standby letters of credit drawn |  |  | $ 0 | $ 0 | $ 0 | $ 0 |  |  |
Standby Letters of Credit | State And Federal Agencies |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 260,000 | 260,000 |  | $ 260,000 | $ 260,000 | $ 260,000 |  |  |
Extended term under letter of credit arrangement (in years) |  |  |  | 1 year | 1 year | 1 year |  |  |
Standby Letters of Credit | Electric Utility Companies |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 741,000 | $ 741,000 |  | $ 741,000 | $ 741,000 | $ 741,000 |  |  |
Extended term under letter of credit arrangement (in years) |  |  |  | 1 year | 1 year |  |  |  |
Debt Term (in years) |  |  |  |  |  | 1 year |  |  |

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