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Note 8 - Stockholders' Equity | 9 Months Ended
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Sep. 27, 2020
Notes to Financial Statements |
Stockholders' Equity Note Disclosure [Text Block] | Note 8 — Stockholders' Equity Common and Preferred Stock As of September 27, 2020, the Company was authorized to issue 200 million shares of common stock and had 10 million shares of authorized but unissued undesignated preferred stock. Without any further vote or action by the Company’s stockholders, the Board of Directors has the authority to determine the powers, preferences, rights, qualifications, limitations or restrictions granted to or imposed upon any wholly unissued shares of undesignated preferred stock. Issuance of Common Stock On March 15, 2019, the Company filed a shelf registration statement on Form S-3, under which the Company may, from time to time, sell securities in one or more offerings up to a total amount of $75 million. The Company’s shelf registration statement was declared effective on March 29, 2019. On June 21, 2019, the Company closed an underwritten public offering of 1.3 million shares of common stock, $0.001 par value per share at a price of $7.00 per share, which included 171,429 shares issued pursuant to the underwriters’ full exercise of their over-allotment option. The Company received net proceeds from the offering of approximately $8.0 million, net of underwriter’s commission and other offering expenses. On June 22, 2020, the Company closed an underwritten public offering of 2.5 million shares of common stock, $0.001 par value per share at a price of $3.50 per share. The Company received gross proceeds from the offering of approximately $8.8 million and incurred stock issuance costs of approximately $1.1 million. Under the terms of the underwriting agreement, the Company granted the underwriter a 30-day option to purchase up to an additional 375,000 shares of common stock to cover overallotments. On July 21, 2020, the underwriter’s partially exercised the option to purchase 141,733 additional shares of common stock in connection with the offering, resulting in additional gross proceeds to the Company of approximately $0.5 million and incurred additional stock issuance costs of approximately $52,000. Total gross proceeds received from this offering was approximately $9.3 million and incurred total stock issuance costs of approximately $1.2﻿ million. Net proceeds received from this offering after deducting stock issuance costs was approximately $8.1 million. As of September 27, 2020, warrants exercisable for 386,100 shares of common stock at an exercise price of $19.32 per share remain outstanding.

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(e)(1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 3: 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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