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EARNINGS PER SHARE (Details Textual) | 6 Months Ended
--- | ---
Jun. 30, 2013 | Jun. 30, 2012
Options (in shares) | 22,383 | 147,917
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | 450,000 | 450,000

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- Definition Stock options during the period. + References No definition available. + Details
Name: | dhrm_StockOptions
Namespace Prefix: | dhrm_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant