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Note 3 - Net Loss Per Share (Details Textual) |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Dec. 23, 2019 | Sep. 27, 2020 shares | Sep. 29, 2019 shares | Sep. 27, 2020 shares | Sep. 29, 2019 shares | May 29, 2018 shares
Reverse Stock Split [Member] |  |  |  |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio | 14 |  |  | 14 |  |
Common Stock [Member] | Maximum [Member] |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  | 386,100
Share-based Payment Arrangement [Member] |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) |  | 979,363 | 559,587 | 979,363 | 559,587 |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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