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

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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.

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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.

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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.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Long-Term Debt - Additional Information (Detail) - USD ($)					1 Months Ended		2 Months Ended	9 Months Ended	12 Months Ended
	Feb. 11, 2021	May 31, 2020	Jan. 26, 2018	Jan. 12, 2018	Dec. 31, 2014	Aug. 31, 2014	Dec. 01, 2020	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2017	Dec. 31, 2021	Sep. 30, 2020	Sep. 04, 2020	Jun. 26, 2019	Jan. 08, 2019	Dec. 31, 2018	Jul. 17, 2018	Dec. 22, 2017	Feb. 15, 2017	Jul. 29, 2014
Debt Instrument [Line Items]
Outstanding borrowings under revolving credit facility									$ 37,000,000
Weighted-average interest rate of borrowings									4.00%
Credit facility remaining borrowing capacity									$ 11,000,000
Long-term Debt, Current Maturities									$ 487,000
Loan Under Paycheck Protection Programme [Member]
Debt Instrument [Line Items]
Long-term Debt, Current Maturities											$ 487,000
Long-term bank debt											$ 1,267,000
Loan Under Paycheck Protection Programme [Member] \| Eastern Oilwells Service Corporation [Member]
Debt Instrument [Line Items]
Proceeds from scheme based loan		$ 470,000
Loan Under Paycheck Protection Programme [Member] \| Prime Operating Company And Eastern Oilwells Company [Member]
Debt Instrument [Line Items]
Long term debt stated rate of interest		1.00%
Loan Under Paycheck Protection Programme [Member] \| Prime Operating Company And Eastern Oilwells Company [Member] \| Possible Forgiveness Of Loan [Member]
Debt Instrument [Line Items]
Period of forgiveness of term loan		10 months
Loan Under Paycheck Protection Programme [Member] \| Prime Operating Company [Member]
Debt Instrument [Line Items]
Proceeds from scheme based loan		$ 1,280,000
Credit Agreement [Member]
Debt Instrument [Line Items]
Credit facility borrowing base													$ 50,000,000	$ 90,000,000	$ 100,000,000	$ 72,000,000
Credit Agreement [Member] \| Fifth Amendment To The Credit Agreement [Member]
Debt Instrument [Line Items]
Line of credit facility decrease in the borrowing base							$ 666,666.67
Additional Equipment Loan [Member]
Debt Instrument [Line Items]
Credit facility remaining borrowing capacity						$ 1,200,000
Equipment Loan, face amount																				$ 6,000,000
Percentage for base rate loans at the prime rate			3.50%			3.40%
Equipment Loan, monthly payment			$ 7,986			$ 87,800
Additional equipment Loan, drawings					$ 500,000	$ 4,800,000
Equipment Loan, interest rate description									interim draws to finance the acquisition of any future field service equipment. In December 2014, the Company made an interim draw of an additional $0.5 million on this facility that is secured by recently purchased field service equipment. Interim draws on this facility carried a floating interest rate; payable monthly at the LIBO published rate plus 2.50% and on June 26, 2015 converted into a fixed term loan, with a rate of 3.50% and requiring monthly payments
Equipment Loan, principal payment amount				$ 20,858
Fixed Term Loan [Member] \| Additional Equipment Loan [Member]
Debt Instrument [Line Items]
Equipment Loan, monthly payment			$ 8,700
Equipment Loan, Interest rate on fixed loans								3.50%
2017 Credit Agreement [Member]
Debt Instrument [Line Items]
Credit facility borrowing capacity																			$ 300,000,000
Credit agreement date										Feb. 15, 2017
Credit facility borrowing base																		$ 85,000,000
Line of credit facility, expiration date										Feb. 15, 2021
2017 Credit Agreement [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Equipment Loan, face amount	$ 40,000,000
Equipment Loan, maturity date	Feb. 11, 2023
2017 Credit Agreement [Member] \| Subsequent Event [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate	3.00%
LIBOR Margin Rate	4.00%
2017 Credit Agreement [Member] \| Subsequent Event [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate	2.00%
LIBOR Margin Rate	3.00%
Credit Agreement [Member]
Debt Instrument [Line Items]
Credit facility borrowing base																	$ 90,000,000
London Interbank Offered Rate (LIBOR) [Member] \| Additional Equipment Loan [Member]
Debt Instrument [Line Items]
LIBOR rate loans								2.50%
Base Rate And Libor [Member] \| Credit Agreement [Member]
Debt Instrument [Line Items]
Debt instrument basis weighted average interest rate spread on variable rate								5.34%				3.95%
Base Rate [Member] \| Credit Agreement [Member] \| Fifth Amendment To The Credit Agreement [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Line of credit borrowing base utilisation percentage													3.50%
Base Rate [Member] \| Credit Agreement [Member] \| Fifth Amendment To The Credit Agreement [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Line of credit borrowing base utilisation percentage													2.50%
Alternate Base Rate [Member] \| Credit Agreement [Member] \| Fifth Amendment To The Credit Agreement [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Line of credit borrowing base utilisation percentage													2.50%
Alternate Base Rate [Member] \| Credit Agreement [Member] \| Fifth Amendment To The Credit Agreement [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Line of credit borrowing base utilisation percentage													1.50%