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Warrants (Details 1) - $ / shares	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2017
Warrants [Abstract]
Range of Exercise Prices	$ 0.25	$ 0.25
Number Outstanding	1,200,000	1,200,000
Weighted Average Remaining Contractual Life	1 year 9 months	2 years 3 months 8 days
Weighted Average Exercise Price	$ 0.25	$ 0.25

X

- Definition

Exercise price.

+ References

No definition available.

+ Details

Name:	olbg_InvestmentWarrantsExercisePrice1
Namespace Prefix:	olbg_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Range of exercise prices warrants.

+ References

No definition available.

+ Details

Name:	olbg_RangeOfExercisePricesWarrants
Namespace Prefix:	olbg_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	olbg_WarrantsDisclosureAbstract
Namespace Prefix:	olbg_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Weighted average remaining contractual life warrants.

+ References

No definition available.

+ Details

Name:	olbg_WeightedAverageRemainingContractualLifeWarrants
Namespace Prefix:	olbg_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of warrants or rights outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

Name:	us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant