Loan Servicing (Details) - USD ($)	Jun. 30, 2019	Jun. 30, 2018
Loan Servicing
Unpaid principal balance of loans serviced for others	$ 2,828,576	$ 1,863,097
Custodial balances maintained by bank	$ 0	$ 6,471

Represents information related to unpaid principal balance of loans serviced for others.

No definition available.

Name:	tebb_UnpaidPrincipalBalanceOfLoansServicedForOthers
Namespace Prefix:	tebb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant