Note 17 - Subsequent Events (Details) - Subsequent Event [Member]	Jan. 23, 2020 USD ($)
11/1/2020 – 11/30/2020	$ 0
12/1/2020 – 10/31/2021	21,257.10
11/1/2021 – 10/31/2022	21,894.81
11/1/2022 – 10/31/2023	22,551.66
11/1/2023 – 10/31/2024	23,228.21
11/1/2024 – 10/31/2025	23,925.05
11/1/2025 – 11/30/2025	$ 24,642.80

Amount of lessee's base monthly rent for operating lease, due in months thirteen through twenty-four after renewal.

No definition available.

Name:	intt_LesseeOperatingLeaseRenewalBaseMonthlyRentMonth13Through24
Namespace Prefix:	intt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of lessee's base monthly rent for operating lease, due in months twenty-five through thirty-six after renewal.

No definition available.

Name:	intt_LesseeOperatingLeaseRenewalBaseMonthlyRentMonth25Through36
Namespace Prefix:	intt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of lessee's base monthly rent for operating lease, due in months thirty-seven through forty-eight after renewal.

No definition available.

Name:	intt_LesseeOperatingLeaseRenewalBaseMonthlyRentMonth37Through48
Namespace Prefix:	intt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of lessee's base monthly rent for operating lease, due in months forty-nine through sixty after renewal.

No definition available.

Name:	intt_LesseeOperatingLeaseRenewalBaseMonthlyRentMonth49Through60
Namespace Prefix:	intt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of lessee's base monthly rent for operating lease, due in month sixty-one after renewal.

No definition available.

Name:	intt_LesseeOperatingLeaseRenewalBaseMonthlyRentMonth61
Namespace Prefix:	intt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of lessee's base monthly rent for operating lease, due first month after renewal.

No definition available.

Name:	intt_LesseeOperatingLeaseRenewalBaseMonthlyRentMonthOne
Namespace Prefix:	intt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of lessee's base monthly rent for operating lease, due in months two through twelve after renewal.

No definition available.

Name:	intt_LesseeOperatingLeaseRenewalBaseMonthlyRentMonthTwoThroughTwelve
Namespace Prefix:	intt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: