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Note 11 - Subsequent Events (Details Textual) | Nov. 19, 2021 $ / shares
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Subsequent Event [Member] | Preferred Share Purchase Right [Member] |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 20.00

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644 + Details
Name: | us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=dakt_PreferredSharePurchaseRightMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |