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DEBT - Maturities (Details)	Mar. 31, 2019 USD ($) instrument	Dec. 31, 2018 USD ($)	Mar. 31, 2018 USD ($)
Aggregate maturities of notes payable
April 2019 - March 2020	$ 3,586,000
April 2020 - March 2021	2,173,000
April 2021 - March 2022	1,086,000
Total notes payable	6,845,000
Aggregate maturities of finance leases:
April 2019 - March 2020	2,873,000
April 2020 - March 2021	1,564,000
April 2021 - March 2022	24,000
April 2022 - March 2023	14,000
Total finance lease liabilities	$ 4,475,000		$ 7,186,000
Minimum
Aggregate maturities of finance leases:
Interest rate on leases	4.65%
Maximum
Aggregate maturities of finance leases:
Interest rate on leases	5.37%
Notes payable to finance companies for insurance
Notes payable
Number of outstanding notes payable | instrument	2
Interest rate (as a percent)		3.80%
Aggregate maturities of notes payable
Total notes payable	$ 1,413,000	$ 1,680,000
Notes payable to finance companies for insurance | Minimum
Notes payable
Interest rate (as a percent)	3.80%
Notes payable to finance companies for insurance | Maximum
Notes payable
Interest rate (as a percent)	4.99%
Notes payable to commercial banks
Notes payable
Number of outstanding notes payable | instrument	1
Interest rate (as a percent)	5.00%	5.00%
Aggregate maturities of notes payable
Total notes payable	$ 5,432,000	$ 5,975,000

X

- Definition

Amount of lessee's discounted obligation for lease payments for finance lease, due in rolling twelve months following latest statement of financial position date. For interim and annual periods when interim periods are reported on rolling approach, from latest statement of financial position date.

+ References

No definition available.

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- Definition

Amount of lessee's discounted obligation for lease payments for finance lease, due in rolling year four following latest statement of financial position date. For interim and annual periods when interim periods are reported on rolling approach, from latest statement of financial position date.

+ References

No definition available.

+ Details

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- Definition

Amount of lessee's discounted obligation for lease payments for finance lease, due in rolling year three following latest statement of financial position date. For interim and annual periods when interim periods are reported on rolling approach, from latest statement of financial position date

+ References

No definition available.

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- Definition

Amount of lessee's discounted obligation for lease payments for finance lease, due in rolling year two following latest statement of financial position date. For interim and annual periods when interim periods are reported on rolling approach, from latest statement of financial position date

+ References

No definition available.

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- Definition

Amount of long-term and short-term debt maturing in the next twelve rolling months.

+ References

No definition available.

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- Definition

The number of outstanding notes payable.

+ References

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Represents the aggregate of total long-term debt, including current maturities and short-term debt.

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- Definition

Present value of lessee's discounted obligation for lease payments from finance lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

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- Definition

Discount rate used by lessee to determine present value of finance lease payments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04.(a))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04.(a))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690

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