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Note 6 - Stockholders' Equity
 12 Months Ended
Dec. 31, 2016
Notes to Financial Statements  
Stockholders' Equity Note Disclosure [Text Block]
Note 
6
 — Stockholders’ Equity
 
Sales of Common Stock
 
On
March
3,
2015,
the Company filed a
$150,000
shelf registration statement on Form S-
3
with the SEC. This shelf registration statement became effective upon filing and allows the Company to sell securities, including common stock, preferred stock, depository shares, stock purchase contracts, warrants and units, from time to time at prices and on terms to be determined at the time of sale. On
February
26,
2016,
the Company filed a post-effective amendment to this registration statement, which allowed for its use by the Company when declared effective by the SEC’s staff on
April
18,
2016.