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Note 15 - Subsequent Events	3 Months Ended
	Mar. 31, 2019
Notes to Financial Statements
Subsequent Events [Text Block]	NOTE 15.       SUBSEQUENT EVENTS Subsequent to March 31, 2019 through April 30, 2019, Cowen sold an additional 175,932 shares of our Class A common stock, under the “at the market” Sales Agreement, resulting in net proceeds to us of $4,244,798 (See Note 11 ).

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-URI http://asc.fasb.org/topic&trid=2122774

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