Organization and Summary of Significant Accounting Policies (Narrative) (Details)	12 Months Ended
Dec. 31, 2020 USD ($) well_service_rigs drilling_rigs wireline_tubing_units	Dec. 31, 2019 USD ($)
Cash and Cash Equivalents
Cash Equivalents, at Carrying Value	$ 0	$ 8,900,000
Restricted Cash from Proceeds of Qualifying Sales of Property & Equipment	200,000
Restricted cash	1,148,000	$ 998,000
Intangible Assets Future Amortization
Finite-Lived Intangible Asset, Expected Amortization, Year One	900,000
Finite-Lived Intangible Asset, Expected Amortization, Year Two	900,000
Finite-Lived Intangible Asset, Expected Amortization, Year Three	900,000
Finite-Lived Intangible Asset, Expected Amortization, Year Four	900,000
Finite-Lived Intangible Asset, Expected Amortization, Year Five	$ 900,000
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesCurrent
Related Party Transaction, Expenses from Transactions with Related Party	$ 200,000
Drilling Services [Member]
Business - Drilling
Drilling Rigs \| drilling_rigs	25
Drilling Services [Member] \| Pad-Capable [Member]
Business - Drilling
Percentage of Drilling Fleet	100.00%
Domestic Drilling [Member] \| Drilling Services [Member] \| United States [Member]
Business - Drilling
Drilling Divisions	3
Drilling Rigs \| drilling_rigs	17
Domestic Drilling [Member] \| Drilling Services [Member] \| United States [Member] \| AC [Member]
Business - Drilling
Drilling Rigs \| drilling_rigs	17
Domestic Drilling [Member] \| Drilling Services [Member] \| United States [Member] \| SCR Drilling Rigs [Member]
Business - Drilling
Drilling Rigs \| drilling_rigs	0
International Drilling [Member] \| Drilling Services [Member] \| Colombia [Member]
Business - Drilling
Drilling Rigs \| drilling_rigs	8
International Drilling [Member] \| Drilling Services [Member] \| Colombia [Member] \| AC [Member]
Business - Drilling
Drilling Rigs \| drilling_rigs	0
International Drilling [Member] \| Drilling Services [Member] \| Colombia [Member] \| SCR Drilling Rigs [Member]
Business - Drilling
Drilling Rigs \| drilling_rigs	8
Well Servicing [Member] \| 550 Horsepower [Member]
Business - Production Services
Well Servicing Rigs \| well_service_rigs	111
Well Servicing [Member] \| 600 Horsepower [Member]
Business - Production Services
Well Servicing Rigs \| well_service_rigs	12
Well Servicing [Member] \| Production Services [Member]
Business - Production Services
Well Servicing Rigs \| well_service_rigs	123
Wireline Services [Member] \| Production Services [Member]
Business - Production Services
Wireline Units \| wireline_tubing_units	76

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