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Note 11 - Subsequent Events | 3 Months Ended | 12 Months Ended
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Mar. 31, 2017 | Dec. 31, 2016
Notes to Financial Statements |  |
Subsequent Events [Text Block] | 11. Subsequent Events During April 2017, we issued an aggregate of 2,500,000 shares of common stock related to the exercise of stock purchase warrants, resulting in total net proceeds of $100,000. During May 2017, we sold 1,000 shares of our Series D convertible preferred stock to certain institutional investors for an aggregate purchase price of $1,000,000. Each share of preferred stock is initially convertible into approximately 66,666.67 shares of our common stock for an aggregate total of 66,666,667 shares of our common stock. | 12 . Subsequent Event During March 2017, we issued 983,334 shares of our common stock pursuant to the exercise of certain stock purchase warrants, resulting in total net proceeds of $49,167.

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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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