SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)		3 Months Ended					6 Months Ended	9 Months Ended		12 Months Ended
	May 28, 2021 USD ($)	Sep. 30, 2021 USD ($) shares	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Sep. 30, 2020 USD ($) shares	Mar. 31, 2020 USD ($)	Jun. 30, 2021 USD ($)	Sep. 30, 2021 USD ($) shares	Sep. 30, 2020 USD ($) shares	Dec. 31, 2020 USD ($)	Jan. 17, 2020 lease	Dec. 31, 2019 USD ($)
Summary of Significant Accounting Policies [Line Items]
Acquisition of non-controlling interest	$ 5,000,000		$ 5,000,000
Cash equivalents at carrying value		$ 0						$ 0		$ 0
Allowance for credit loss, current		349,311			$ 1,373,921			349,311	$ 1,373,921	909,182		$ 623,970
Other than temporary impairment								0		0
Impairment of long-lived assets held-for-use								0		0
Operating lease right-of-use assets		2,551,286	2,743,177	$ 2,317,313			$ 2,743,177	2,551,286		931,630
Operating lease liabilities		$ 2,697,704	2,765,010	2,324,257			2,765,010	$ 2,697,704		931,630
Antidilutive securities excluded from computation of earnings per share (in shares) | shares		6,687			0			0	0
Property and equipment, net		$ 141,740,117	142,454,686	143,814,208			142,454,686	$ 141,740,117		136,869,085
Total assets		514,503,271	501,337,099	494,894,924			501,337,099	514,503,271		484,227,605
Obligations under finance leases, non-current		8,448,619	8,491,408	8,538,421			8,491,408	8,448,619		766,885
Obligations under operating leases, non-current		2,010,664	2,185,669	1,695,546			2,185,669	2,010,664		623,482
Total liabilities		$ 241,171,355	236,326,527	228,311,267			236,326,527	$ 241,171,355		219,426,172
Operating lease expense			$ 340,551	$ 410,561			$ 751,112
Operating lease, weighted average remaining lease term		48 months	50 months	48 months	32 months		50 months	48 months	32 months
Operating lease, weighted average discount rate		3.11%	3.15%	2.80%	4.05%		3.15%	3.11%	4.05%
Finance lease costs		$ 97,671	$ 288,599	$ 234,849	$ 161,334		$ 523,448	$ 296,982	$ 491,827
Finance lease, property and equipment, at cost		10,421,383	10,611,480	10,611,480			10,611,480	10,421,383		2,793,731
Finance lease, accumulated depreciation		$ 2,030,594	$ 2,118,289	$ 1,966,019			$ 2,118,289	$ 2,030,594		$ 1,831,318
Finance lease, weighted average remaining lease term		294 months	295 months	295 months			295 months	294 months		43 months
Finance lease, weighted average discount rate		6.17%	6.18%	6.18%			6.18%	6.17%		7.56%
Goodwill impairment loss		$ 0			0	$ 338,200,000		$ 0	338,191,407
Previously Reported
Summary of Significant Accounting Policies [Line Items]
Operating lease right-of-use assets			$ 16,326,011	$ 15,993,197			$ 16,326,011
Operating lease liabilities			16,540,991	16,096,714			16,540,991
Property and equipment, net			134,755,748	136,043,983			134,755,748
Total assets			507,220,995	500,800,583			507,220,995
Obligations under finance leases, non-current			630,774	703,648			630,774
Obligations under operating leases, non-current			15,930,735	15,459,667			15,930,735
Total liabilities			242,241,874	234,248,951			242,241,874
Revision of Prior Period, Error Correction, Adjustment
Summary of Significant Accounting Policies [Line Items]
Operating lease right-of-use assets			(13,582,834)	(13,675,884)			(13,582,834)
Property and equipment, net			7,698,938	7,770,225			7,698,938
Total assets			(5,883,896)	(5,905,659)			(5,883,896)
Obligations under finance leases, non-current			7,860,634	7,834,773			7,860,634
Obligations under operating leases, non-current			(13,745,066)	(13,764,121)			(13,745,066)
Total liabilities			(5,915,347)	$ (5,937,684)			$ (5,915,347)
Non-controlling Interests
Summary of Significant Accounting Policies [Line Items]
Acquisition of non-controlling interest	1,144,113		1,144,113
Additional Paid-in Capital
Summary of Significant Accounting Policies [Line Items]
Acquisition of non-controlling interest	$ 3,855,887		$ 3,855,887
Kirnland
Summary of Significant Accounting Policies [Line Items]
Ownership percentage by parent	33.33%	100.00%						100.00%
B & R Realty, LLC ("BRR")
Summary of Significant Accounting Policies [Line Items]
Number of leases terminated through acquisitions | lease											9
Selling, General and Administrative Expenses
Summary of Significant Accounting Policies [Line Items]
Cost of goods and services sold		$ 2,703,921			$ 1,640,914			$ 7,103,131	5,167,163
Other Income (Expenses) | Revision of Prior Period, Error Correction, Adjustment
Summary of Significant Accounting Policies [Line Items]
Goodwill impairment loss									(338,191,407)
Operating Expense | Revision of Prior Period, Error Correction, Adjustment
Summary of Significant Accounting Policies [Line Items]
Goodwill impairment loss									$ 338,191,407
Two Suppliers | Advance Payments Outstanding | Cost of Goods and Service Benchmark
Summary of Significant Accounting Policies [Line Items]
Operating concentration risk (percentage)								33.00%		40.00%
One Supplier | Advance Payments to Related Parties | Cost of Goods and Service Benchmark
Summary of Significant Accounting Policies [Line Items]
Operating concentration risk (percentage)										96.00%