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Note 13 - Revenues - Warranties (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Warranty, Beginning Balance | $ 252 | $ 391
Warranty Additions | 77 | 10
Warranty (Payments) or Credits | (143) | (149)
Warranty, Ending Balance | $ 186 | $ 252

X
- Definition Amount of decrease in the standard product warranty accrual from payments made in cash or in kind to satisfy claims under the terms of the standard product warranty , or an increase due to credits received. Excludes extended product warranties. + References No definition available. + Details
Name: | hbio_StandardProductWarrantyAccrualDecreaseForPaymentsOrIncreaseForCredits
Namespace Prefix: | hbio_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount as of the balance sheet date of the aggregate standard product warranty liability. Does not include the balance for the extended product warranty liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c)(1),(c)(5) -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 + Details
Name: | us-gaap_StandardProductWarrantyAccrual
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of increase in the standard product warranty accrual from warranties issued. Excludes extended product warranties. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph ((c)(3)) -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 + Details
Name: | us-gaap_StandardProductWarrantyAccrualWarrantiesIssued
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration