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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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- Definition

Extended term for surety bonds, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Extended term under letter of credit arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount on which renewable not applicable on surety bonds.

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Amount of surety bonds.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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Amount of operating lease expense. Excludes sublease income.

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Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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