Commitments and Contingencies (Details) - Schedule of maturities of the lease liabilities $ in Thousands	Dec. 31, 2020 USD ($)
Schedule of maturities of the lease liabilities [Abstract]
Amount remaining year ending December 31, 2021	$ 463
2022	922
2023	943
2024	87
Thereafter
Total	2,415
Less present value discount	199
Total operating lease liabilities	$ 2,216

Capital Leases, Future Minimum Payments Due, Total

No definition available.

Name:	bdr_CapitalLeaseFutureMinimumPaymentsDue
Namespace Prefix:	bdr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of minimum lease payments for capital leases due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

No definition available.

+ Details

Name:	bdr_CapitalLeaseFutureMinimumPaymentsDueCurrent
Namespace Prefix:	bdr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of minimum lease payments for capital leases due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

No definition available.

+ Details

Name:	bdr_CapitalLeaseFutureMinimumPaymentsDueInFourYears
Namespace Prefix:	bdr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of minimum lease payments for capital leases due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

No definition available.

+ Details

Name:	bdr_CapitalLeaseFutureMinimumPaymentsDueInThreeYears
Namespace Prefix:	bdr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of minimum lease payments for capital leases due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

No definition available.

+ Details

Name:	bdr_CapitalLeaseFutureMinimumPaymentsDueInTwoYears
Namespace Prefix:	bdr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of minimum lease payments for capital leases due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

No definition available.

+ Details

Name:	bdr_CapitalLeaseFutureMinimumPaymentsDueThereafter
Namespace Prefix:	bdr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Capital Leases, Future Minimum Payments, Net Minimum Payments, Total

+ References

No definition available.

+ Details

Name:	bdr_CapitalLeasesFutureMinimumPaymentNetMinimumPayments1
Namespace Prefix:	bdr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

+ Details

Name:	bdr_ScheduleOfMaturitiesOfTheLeaseLiabilitiesAbstract
Namespace Prefix:	bdr_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977

+ Details

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