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Long-term Debt - Narrative (Details) |  |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jan. 15, 2021 USD ($) | Jan. 01, 2019 USD ($) | Dec. 20, 2018 USD ($) installment | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jun. 29, 2018 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Long-term debt outstanding |  |  |  |  |  | $ 61,370,000 | $ 75,554,000 |
Extraordinary expenses |  |  |  | $ 636,000 |  |  |  |
Palmerof Texas Tanks Inc |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Asset impairments |  |  |  |  |  | $ 6,000,000.0 |  |
Losses from suspended operations |  |  |  | $ 740,000 | $ 1,560,000 |  |  |
Revolving Line of Credit |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Minimum fixed charge coverage ratio |  |  |  |  |  | 1.25 |  |
Line of credit, average outstanding amount |  |  |  |  |  | $ 60,300,000 | $ 69,100,000 |
Line of credit, weighted average interest rate |  |  |  |  |  | 3.50% | 5.52% |
Interest payments |  |  |  |  |  | $ 2,000,000.0 | $ 3,500,000 |
Covenants, minimum tangible net worth |  |  |  |  |  | $ 60,000,000.0 |  |
Minimum fixed charge coverage ratio actual |  |  |  |  |  | 1.43 |  |
Covenants, minimum tangible net worth actual |  |  |  |  |  | $ 67,100,000 |  |
The Facility | Line of Credit | Revolving Line of Credit | Subsequent Event |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt term | 4 years |  |  |  |  |  |  |
Line of credit, maximum borrowing capacity | $ 150,000,000.0 |  |  |  |  |  |  |
Initial borrowing capacity | 110,000,000.0 |  |  |  |  |  |  |
Minimum amount of availability required to be had under facility | $ 11,000,000.0 |  |  |  |  |  |  |
Minimum fixed charge coverage ratio | 1.0 |  |  |  |  |  |  |
The Facility | Line of Credit | LIBOR | Revolving Line of Credit | Subsequent Event |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.50% |  |  |  |  |  |  |
ABL Line Of Credit, Due December 20, 2021 | Revolving Line of Credit |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Line of credit, maximum borrowing capacity |  |  | $ 100,000,000 |  |  | 60,000,000.0 |  | $ 80,000,000
Principal amount of debt |  |  |  |  |  | $ 100,000,000 |  |
Stated interest rate |  |  |  |  |  | 1.81% | 3.50% |
Unused capacity fee on line of credit |  |  |  |  |  | 0.15% |  |
Line of credit, amount borrowed |  |  |  |  |  | $ 49,000,000.0 |  |
Line of credit, remaining availability |  |  |  |  |  | 11,000,000.0 |  |
ABL Line Of Credit, Due December 20, 2021 | Revolving Line of Credit | LIBOR |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 1.65% |  |  |  |  |
ABL Line Of Credit, Due December 20, 2021 | Line of Credit | Revolving Line of Credit |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Line of credit, maximum borrowing capacity |  |  | $ 100,000,000.0 |  |  |  |  |
Term Loan |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt term |  | 5 years | 5 years |  |  |  |  |
Principal amount of debt |  | $ 20,000,000 | $ 20,000,000 |  |  |  |  |
Repayments of debt, number of consecutive installments | installment |  |  | 60 |  |  |  |  |
Term Loan | LIBOR |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 1.90% |  |  |  |  |
Term Loan | Secured Debt |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt term |  |  | 5 years |  |  |  |  |
Principal amount of debt |  |  | $ 20,000,000 |  |  | $ 20,000,000 |  |
Stated interest rate |  |  |  |  |  | 2.06% | 3.69% |
Long-term debt outstanding |  |  |  |  |  | $ 12,300,000 | $ 16,300,000 |
Term Loan | Secured Debt | LIBOR | Subsequent Event |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.65% |  |  |  |  |  |  |

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228 + Details
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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=120391452&loc=d3e13212-122682 + Details
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- Definition Amount of gain (loss) from sale and disposal of integrated set of activities and assets capable of being conducted and managed for purpose of providing return in form of dividend, lower cost, or other economic benefit to investor, owner, member and participant. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4582445-111684 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the 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)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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- Definition Average amount borrowed under the credit facility during the period. + References No definition available. + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The effective interest rate during the reporting period. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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