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Note 6 - Stockholders' Equity | 12 Months Ended
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Dec. 31, 2018
Notes to Financial Statements |
Stockholders' Equity Note Disclosure [Text Block] | Note 6 — Stockholders’ Equity Sales of Common Stock 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. In September 2017, the Company completed a public offering of 17,864 shares of its common stock at a price of $5.15 per share, which included the underwriters’ overallotment option to purchase additional shares. Net proceeds were approximately $86,250 after deducting underwriting discounts and offering expenses. 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. On August 6, 2018, the Company completed an underwritten public offering of 10,455 shares of its common stock, offered at a price to the public of $5.50 per share, including shares issued pursuant to the underwriters’ 30 -day option to purchase additional shares, which was exercised in full. The net proceeds from this offering to the Company were approximately $53,400 after deducting underwriting discounts and commissions and estimated 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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