EMPLOYEE INCENTIVE PLANS (Details) - USD ($)	12 Months Ended
Apr. 30, 2020	Apr. 30, 2019
401(k) Retirement Plan
Employee incentive plans
Employer contributions	$ 169,000	$ 148,000
Performance Bonus
Employee incentive plans
Discretionary bonus expense	226,000	209,000
Short Term Cash Incentive Plan
Employee incentive plans
Incentive plan expense	$ 0	0
Stock Award Plan \| Restricted Stock
Employee incentive plans
Restriction period of awards	5 years
Long Term Cash Incentive Plan
Employee incentive plans
Incentive plan expense	$ 0	$ 0

The expense during the period relating to discretionary performance bonuses.

No definition available.

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Namespace Prefix:	ttlo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The expense during the period relating to the incentive plan.

+ References

No definition available.

+ Details

Name:	ttlo_IncentivePlanExpense
Namespace Prefix:	ttlo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

+ Details

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- Details

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Namespace Prefix:
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- Details

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Namespace Prefix:
Data Type:	na
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- Details

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- Details

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Namespace Prefix:
Data Type:	na
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- Details

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Namespace Prefix:
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- Details

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