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Note 16 - Subsequent Event | 12 Months Ended
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Dec. 31, 2017
Notes to Financial Statements |
Subsequent Events [Text Block] | 16. Subsequent Event On January 22, 2018, Diffusion Pharmaceuticals Inc. (the “Company”) closed its previously announced underwritten public offering of 15,000,000 shares of the Company’s common stock, par value $0.001 per share (“Common Stock”), and warrants to purchase 15,000,000 shares of Common Stock. At the closing, the Company also issued warrants to purchase an additional 1,970,625 shares of Common Stock pursuant to the underwriter’s partial exercise of its overallotment option. The shares of Common Stock and warrants were sold at a combined public offering price of $0.80 per share and warrant for total gross proceeds of approximately $12.0 million. The warrants have an exercise price of $0.80 per share and a term of five years from the date of issuance. In addition, at the closing, the Company issued to designees of the underwriter of the offering warrants to purchase up to 750,000 shares of Common Stock. The underwriter’s warrants have an exercise price of $1.00, a term of five years from the date of issuance and otherwise substantially similar terms to the form of investor warrant. As a result of the offering, all outstanding shares of the Company's Series A convertible preferred stock converted into 20,568,632 shares (the "Conversion Shares) of common stock (including accrued dividends paid in kind and the "make-whole" adjustment feature thereof).

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- Definition The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 855 -URI http://asc.fasb.org/topic&trid=2122774 + Details
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