Note 11 - Fair Value Measurements (Details Textual) - Diffusion LLC [Member]	Jan. 08, 2016 USD ($)
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

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.

No definition available.

Name:	dffn_BusinessCombinationNumberOfContingentValueRightsPerShareCalledByEachPreviouslyHeldShareOfCommonStock
Namespace Prefix:	dffn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant