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Supplementary Balance Sheet Information (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure Text Block Supplement [Abstract]
Average rate of short-term deposit	1.27%	2.42%

X

- Definition

Percentage of short term average rate deposits.

+ References

No definition available.

+ Details

Name:	mndo_ShortTermDepositsAverageRate
Namespace Prefix:	mndo_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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