The minimum percentage for CB floating rate.

No definition available.

Name:	ntic_CBFloatingRateFloor
Namespace Prefix:	ntic_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the fixed charge coverage ratio for the debt instrument under the covenant terms.

+ References

No definition available.

+ Details

Name:	ntic_DebtInstrumentCovenantsFixedChargeCoverageRatio
Namespace Prefix:	ntic_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

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-Name Accounting Standards Codification
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Period Type:	instant

- 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

+ Details

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The effective interest rate at the end of the reporting period.

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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

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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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	srt_ConsolidatedEntitiesAxis=ntic_NTICChinaMember
Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ntic_TermLoanInAprilMember
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Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=ntic_JPMorganChaseBankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Period Type:

Note 8 - Corporate Debt (Details Textual)	Jan. 06, 2025 USD ($)	Jan. 06, 2023 USD ($)	Jul. 08, 2025 USD ($)	May 31, 2025 USD ($)	May 29, 2025 USD ($)	May 29, 2025 CNY (¥)	Jan. 05, 2025 USD ($)	Aug. 31, 2024 USD ($)	May 31, 2024
NTIC China [Member] \| Term Loan in May [Member]
Debt Instrument, Face Amount					$ 1,390,000	¥ 10,000,000
Debt Instrument, Interest Rate, Stated Percentage				2.96%
Long-Term Debt				$ 2,778,125				$ 2,820,835
NTIC China [Member] \| Term Loan in April [Member]
Debt Instrument, Interest Rate, Stated Percentage				2.75%
Revolving Credit Facility [Member] \| JP Morgan Chase Bank [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 8,000,000	$ 10,000,000	$ 10,000,000				$ 10,000,000
Long-Term Line of Credit				$ 7,369,949				$ 4,291,608
CB Floating Rate Floor	2.50%
Line of Credit Facility, Interest Rate at Period End				6.65%					7.44%
Debt Instrument, Covenants, Fixed Charge Coverage Ratio	1.25
Revolving Credit Facility [Member] \| JP Morgan Chase Bank [Member] \| Adjusted SOFR Rate Applicable Margin [Member]
Debt Instrument, Basis Spread on Variable Rate	2.35%	2.15%
Revolving Credit Facility [Member] \| JP Morgan Chase Bank [Member] \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Debt Instrument, Basis Spread on Variable Rate	0.10%
Standby Letters of Credit [Member] \| JP Morgan Chase Bank [Member]
Line of Credit Facility, Maximum Borrowing Capacity		$ 5,000,000