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Note 6 - Stockholders' Equity | 3 Months Ended
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Mar. 31, 2017
Notes to Financial Statements |
Stockholders' Equity Note Disclosure [Text Block] | Note 6 — 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 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. In March 2017, the Company completed a public offering of 6,061 shares of its common stock at a price of $8.50 per share, which included the underwriters’ overallotment option to purchase additional shares. Net proceeds were approximately $47,750 after deducting underwriting discounts and offering expenses.

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- Definition 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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