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Note 4 - Fair Value Measurement and Fair Value of Financial Instruments - Contingent Consideration Obligations Inputs and Assumptions (Details)	Sep. 30, 2021
Measurement Input, Revenue Discount Rate [Member]
Business combination, measurement input	0.035
Measurement Input, Discount Rate [Member]
Business combination, measurement input	0.110
Measurement Input, Revenue Volatility [Member]
Business combination, measurement input	0.105

X

- Definition

Value of input used to measure contingent consideration liability from business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

+ Details

Name:	us-gaap_BusinessCombinationContingentConsiderationLiabilityMeasurementInput
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_MeasurementInputTypeAxis=blin_MeasurementInputRevenueDiscountRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputDiscountRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_MeasurementInputTypeAxis=blin_MeasurementInputRevenueVolatilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: