Note 3 - Lincoln Park Financing	3 Months Ended
Mar. 31, 2019
Notes to Financial Statements
Stock Purchase Agreement [Text Block]	Note 3. Lincoln Park Financing On August 25, 2017, we entered into a stock purchase agreement (“LPC Purchase Agreement”) with Lincoln Park Capital Fund, LLC (“Lincoln Park”), pursuant to which Lincoln Park agreed to purchase from us at our request up to an aggregate of $10 million of our common stock (subject to certain limitations) from time to time over a period of three years. The LPC Purchase Agreement allows us, from time to time and at our sole discretion, to direct Lincoln Park to purchase shares of our common stock, subject to limitations in both volume and dollar amount. The purchase price of the shares that may be sold to Lincoln Park under the Purchase Agreement is the lower of (i) the lowest sale price on the date of purchase, or (ii) the average of the three lowest closing prices in the prior 12 business days. There are no restrictions on future financings, rights of first refusal, participation rights, penalties or liquidated damages in the LPC Purchase Agreement or LPC RRA other than a prohibition on entering into a “Variable Rate Transaction,” as defined in the Purchase Agreement. Lincoln Park may not assign or transfer its rights and obligations under the Purchase Agreement. We did not sell any shares to Lincoln Park during the three months ended March 31, 2019. During the three months ended March 31, 2018, we elected to sell to Lincoln Park 650,000 shares of our common stock for which we received $168,220. Additionally, we issued Lincoln Park 8,226 “additional commitment” shares. We record stock sales in our equity statement and the additional commitment shares issued reduce the deferred offering costs on our balance sheet.

Note

Lincoln Park Financing

August 25, 2017,

we entered into a stock purchase agreement (“LPC Purchase Agreement”) with Lincoln Park Capital Fund, LLC (“Lincoln Park”), pursuant to which Lincoln Park agreed to purchase from us at our request up to an aggregate of

$10

million of our common stock (subject to certain limitations) from time to time over a period of

three

years. The LPC Purchase Agreement allows us, from time to time and at our sole discretion, to direct Lincoln Park to purchase shares of our common stock, subject to limitations in both volume and dollar amount. The purchase price of the shares that

may

be sold to Lincoln Park under the Purchase Agreement is the lower of (i) the lowest sale price on the date of purchase, or (ii) the average of the

three

lowest closing prices in the prior

business days. There are

restrictions on future financings, rights of

first

refusal, participation rights, penalties or liquidated damages in the LPC Purchase Agreement or LPC RRA other than a prohibition on entering into a “Variable Rate Transaction,” as defined in the Purchase Agreement. Lincoln Park

may

not

assign or transfer its rights and obligations under the Purchase Agreement.

We did

not

sell any shares to Lincoln Park during the

three

months ended

March 31, 2019.

During the

three

months ended

March 31, 2018,

we elected to sell to Lincoln Park

650,000

shares of our common stock for which we received

$168,220.

Additionally, we issued Lincoln Park

8,226

“additional commitment” shares.

We record stock sales in our equity statement and the additional commitment shares issued reduce the deferred offering costs on our balance sheet.