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NOTE 11 - STOCK AND RETIREMENT PLANS (Details) (USD $) | 12 Months Ended | 1 Months Ended
--- | --- | ---
Dec. 31, 2012 | Jan. 31, 2012 OneMillionProgramMember | Dec. 31, 2011 OneMillionProgramMember | Nov. 30, 2011 OneMillionProgramMember | Mar. 31, 2012 SixMillionProgramMember | Feb. 29, 2012 SixMillionProgramMember | Jan. 31, 2012 SixMillionProgramMember
Total Number of Shares Purchased |  | 10,581 | 30,848 | 32,068 | 1,056,514 | 243,862 | 171,832
Average Price Paid per Share | $ 4.02 | $ 3.90 | $ 4.07 | $ 3.88 | $ 3.95 | $ 4.25 | $ 4.18
Total Number of Shares Purchased as Part of Publicly Announced Repurchase Program | 1,545,705 | 10,581 | 30,848 | 32,068 | 1,056,514 | 243,862 | 171,832
Approximate Dollar Value of Shares that May Yet Be Purchased under the Program |  | $ 0 | $ 747,463 | $ 874,328 | $ 0 | $ 4,228,920 | $ 5,274,294

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- Definition Custom Element. + References No definition available. + Details
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Namespace Prefix: | DAIO_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Custom Element. + References No definition available. + Details
Name: | DAIO_AveragePricePaidPerShareForShareRepurchase
Namespace Prefix: | DAIO_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition Custom Element. + References No definition available. + Details
Name: | DAIO_TotalNumberOfSharesPurchasedAsPartOfPubliclyAnnouncedRepurchaseProgram
Namespace Prefix: | DAIO_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Section B -Paragraph 11A -Chapter 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration