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Inventories (Details Textual) $ in Thousands	Sep. 30, 2019 USD ($)
Inventory Disclosure [Abstract]
Carrying amount of inventories to net realizable	$ 863

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

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