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Note 2 - Net Loss Per Common Share - Anti-dilutive Common Stock Equivalents Excluded from Diluted Net Loss Per Common Share (Details) - shares | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Total common stock equivalents (in shares) | 5,795,658 | 6,503,879 | 5,756,805 | 6,370,306
Share-based Payment Arrangement, Option [Member] |  |  |  |
Total common stock equivalents (in shares) | 4,823,917 | 5,721,801 | 4,792,022 | 5,696,450
Employee Stock Purchase Plan Shares [Member] |  |  |  |
Total common stock equivalents (in shares) | 26,416 | 29,471 | 23,007 | 27,582
Restricted Stock Units (RSUs) [Member] |  |  |  |
Total common stock equivalents (in shares) | 945,325 | 752,607 | 941,776 | 646,274

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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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