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Note 13 - Stock-based Compensation - Summary of Share Vesting Activity (Details) - New Options [Member] - Stock Incentive Plan 2014 [Member]	Jun. 15, 2022 shares
Vesting at Share Price Target of $6.00 [Member]
Percentage of Shares Vested	5.00%
Vesting at Share Price Target of $9.00 [Member]
Percentage of Shares Vested	10.00%
Vesting at Share Price Target of $12.00 [Member]
Percentage of Shares Vested	15.00%
Vesting at Share Price Target of $15.00 [Member]
Percentage of Shares Vested	20.00%
Vesting at Share Price Target of $18.00 [Member]
Percentage of Shares Vested	25.00%
Vesting at Guaranteed Price [Member]
Percentage of Shares Vested	25.00%
Chief Executive Officer [Member]
Options expected to vest (in shares)	333,334
Chief Executive Officer [Member] | Vesting at Share Price Target of $6.00 [Member]
Options expected to vest (in shares)	16,667
Chief Executive Officer [Member] | Vesting at Share Price Target of $9.00 [Member]
Options expected to vest (in shares)	33,334
Chief Executive Officer [Member] | Vesting at Share Price Target of $12.00 [Member]
Options expected to vest (in shares)	50,000
Chief Executive Officer [Member] | Vesting at Share Price Target of $15.00 [Member]
Options expected to vest (in shares)	66,667
Chief Executive Officer [Member] | Vesting at Share Price Target of $18.00 [Member]
Options expected to vest (in shares)	83,333
Chief Executive Officer [Member] | Vesting at Guaranteed Price [Member]
Options expected to vest (in shares)	83,333
Chief Financial Officer [Member]
Options expected to vest (in shares)	200,000
Chief Financial Officer [Member] | Vesting at Share Price Target of $6.00 [Member]
Options expected to vest (in shares)	10,000
Chief Financial Officer [Member] | Vesting at Share Price Target of $9.00 [Member]
Options expected to vest (in shares)	20,000
Chief Financial Officer [Member] | Vesting at Share Price Target of $12.00 [Member]
Options expected to vest (in shares)	30,000
Chief Financial Officer [Member] | Vesting at Share Price Target of $15.00 [Member]
Options expected to vest (in shares)	40,000
Chief Financial Officer [Member] | Vesting at Share Price Target of $18.00 [Member]
Options expected to vest (in shares)	50,000
Chief Financial Officer [Member] | Vesting at Guaranteed Price [Member]
Options expected to vest (in shares)	50,000

X

- Definition

Number of option shares eligible to vest under share-based compensation arrangement.

+ References

No definition available.

+ Details

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Namespace Prefix:	crex_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of vesting of award under share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

+ Details

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- Details

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- Details

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- Details

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- Details

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- Details

Name:	us-gaap_VestingAxis=crex_VestingAtSharePriceTargetOf1200Member
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X

- Details

Name:	us-gaap_VestingAxis=crex_VestingAtSharePriceTargetOf1500Member
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- Details

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X

- Details

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- Details

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- Details

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