Financing Receivable, Amount of Loans Authorized.

No definition available.

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Namespace Prefix:	tbba_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of financing receivable requested to be modified.

+ References

No definition available.

+ Details

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

- Definition

Amount of financing receivables requested to be modified and performing in accordance with the Cares Act.

+ References

No definition available.

+ Details

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Namespace Prefix:	tbba_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Financing Receivable, Number of Loans Authorized.

+ References

No definition available.

+ Details

Name:	tbba_FinancingReceivableNumberOfLoansAuthorized
Namespace Prefix:	tbba_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of financing receivables requested to be modified.

+ References

No definition available.

+ Details

Name:	tbba_FinancingReceivableNumberOfModifiedLoansRequested
Namespace Prefix:	tbba_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of financing receivables requested to be modified and performing in accordance with the Cares Act.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of processing fee income received from the SBA.

+ References

No definition available.

+ Details

Name:	tbba_PercentageOfProcessingFeeIncome
Namespace Prefix:	tbba_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

No Definition available

+ References

No definition available.

+ Details

Name:	tbba_PercentageOfThirdPartyServiceFeePayable
Namespace Prefix:	tbba_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of processing fee income.

+ References

No definition available.

+ Details

Name:	tbba_ProcessingFeeIncome
Namespace Prefix:	tbba_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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

Name:	us-gaap_FinancingReceivableImpairedLineItems
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

+ Details

Name:	us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of financing receivable modified as troubled debt restructuring.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=118939409&loc=d3e18845-111554

+ Details

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

- Details

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- Details

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Summary of Significant Accounting Policies - Significant Events (Details)		12 Months Ended
	Mar. 27, 2020	Jun. 30, 2020 USD ($) loan	Jun. 30, 2019 loan
Financing Receivable, Impaired [Line Items]
Number of modified loans requested \| loan		87
Amount of modified loans requested		$ 27,959,661
Modified loans requested and performing under Cares Act		$ 27,800,000
Percentage of modifed loans requested and performing under Cares Act		99.30%
TDR's granted during the period \| loan		1	0
TDR's outstanding		$ 195,924
Small Business Administration (SBA), CARES Act, Paycheck Protection Program
Financing Receivable, Impaired [Line Items]
Number of loans authorized \| loan		16
Amount of loans authorized		$ 1,100,000
Processing Fee Income		$ 35,000
Small Business Administration (SBA), CARES Act, Paycheck Protection Program \| Minimum
Financing Receivable, Impaired [Line Items]
Percentage Of Processing Fee Income	1.00%
Percentage Of Third Party Service Fee Payable	0.25%
Small Business Administration (SBA), CARES Act, Paycheck Protection Program \| Maximum
Financing Receivable, Impaired [Line Items]
Percentage Of Processing Fee Income	5.00%
Percentage Of Third Party Service Fee Payable	1.00%