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Note 5 - Stockholders' Equity
 3 Months Ended
Mar. 31, 2016
Notes to Financial Statements  
Stockholders' Equity Note Disclosure [Text Block]
Note 5 — Stockholders’ Equity
 
On March 3, 2015, the Company filed a $150,000 shelf registration statement on Form S-3 with the SEC. This shelf registration statement, as amended by a post-effective amendment filed on February 26, 2016 and declared effective on April 18, 2016, 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 November 6, 2013, the Company filed a $125,000 shelf registration statement on Form S-3 with the SEC. This shelf registration statement was declared effective in November 2013 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. The Company has $10,000 remaining under this shelf registration statement.