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Note 6 - Stockholders' Equity	6 Months Ended
	Jun. 30, 2018
Notes to Financial Statements
Stockholders' Equity Note Disclosure [Text Block]	Note 6 — Stockholders’ Equity On November 8, 2017, the Company filed a $200,000 shelf registration statement on Form S- 3 with the SEC. This shelf registration statement became effective on December 12, 2017 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. In August 2018, the Company completed a SEC registered offering of its common stock. See Note 7 – Subsequent Events.

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The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-URI http://asc.fasb.org/topic&trid=2208762

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