NOTES PAYABLE AND DEBT INSTRUMENTS - Summary of Revenue Bonds (Details) - Notes Payable	Sep. 30, 2021 USD ($)
2020A Bond Series Maturing December 1, 2025
Debt Instrument [Line Items]
Principal amount	$ 12,370,000
Interest rate, percent	6.25%
2020A Bond Series Maturing December 1, 2030
Debt Instrument [Line Items]
Principal amount	$ 38,700,000
Interest rate, percent	6.50%
2020A Bond Series Maturing December 1, 2042
Debt Instrument [Line Items]
Principal amount	$ 168,480,000
Interest rate, percent	7.00%
2020B Bond Series Maturing December 1, 2025
Debt Instrument [Line Items]
Principal amount	$ 10,000,000
Interest rate, percent	10.00%
2020B Bond Series Maturing December 1, 2027
Debt Instrument [Line Items]
Principal amount	$ 10,000,000
Interest rate, percent	10.00%
2020C Bond Series Maturing December 1, 2027
Debt Instrument [Line Items]
Principal amount	$ 10,000,000
Interest rate, percent	13.00%