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Note 11 - Fair Value Measurements (Details Textual) - Diffusion LLC [Member] | Jan. 08, 2016 USD ($)
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Business Combination, Number of Contingent Value Rights per Share Called by Each Previously Held Share of Common Stock | 1
Business Combination, Period Following Merger in Which Receipt of Cash for Discontinued Product Assets Would Trigger Contingent Value Right Payements | 5 years
Business Combination, Contingent Value Right Payout Maximum | $ 50,000,000

X
- Definition The maximum amount the reporting entity will pay to holders of contingent value rights related to a business acquisition. + References No definition available. + Details
Name: | dffn_BusinessCombinationContingentValueRightPayoutMaximum
Namespace Prefix: | dffn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The number of contingent value rights (non-transferable rights subject to certain limited exceptions to potentially receive certain cash payments in the event of specified contingencies) issued per share of each previously held shares of common stock as part of a business combination. + References No definition available. + Details
Name: | dffn_BusinessCombinationNumberOfContingentValueRightsPerShareCalledByEachPreviouslyHeldShareOfCommonStock
Namespace Prefix: | dffn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The period following a merger that, if the reporting entity receives net cash payments for the sale of any of the assets related to a discontinued product line, would trigger a required payment to holders of contingent value rights. + References No definition available. + Details
Name: | dffn_BusinessCombinationPeriodFollowingMergerInWhichReceiptOfCashForDiscontinuedProductAssetsWouldTriggerContingentValueRightPayements
Namespace Prefix: | dffn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=dffn_DiffusionLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |