The amount of rent expense relief for leases of lessee.

No definition available.

Name:	io_LeasesLesseeRentExpenseRelief
Namespace Prefix:	io_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The percentage of interest rate for finance leases of the lessee.

+ References

No definition available.

+ Details

Name:	io_LesseeFinanceLeaseInterestRatePercent
Namespace Prefix:	io_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Remaining lease term of lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	io_LesseeLeaseRemainingLeaseTerm
Namespace Prefix:	io_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Term of lessee's lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	io_LesseeLeaseRenewalTerm
Namespace Prefix:	io_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Term of lessee's lease termination, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	io_LesseeLeaseTerminationPeriod
Namespace Prefix:	io_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of operating lease expense. Excludes sublease income.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918638-209977

+ Details

Name:	us-gaap_OperatingLeaseExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_LeaseContractualTermAxis=io_HoustonDataCenterLeaseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Note 11 - Lease Obligations (Details Textual) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	May 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Lessee, Lease, Renewal Term (Year)		10 years
Lessee, Lease, Termination Period (Year)		1 year
Operating Lease, Expense		$ 2.6	$ 2.5
Houston Data Center Lease [Member]
Leases, Lessee, Rent Expense Relief	$ 4.0
Minimum [Member]
Lessee, Lease, Remaining Lease Term (Year)		1 year
Maximum [Member]
Lessee, Lease, Remaining Lease Term (Year)		10 years
Lessee, Finance Lease, Interest Rate, Percent		8.70%