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Note 2 - Loss (Income) Per Share - Antidilutive Securities Excluded from Calculation of Diluted Income (Loss) Per Share (Details) - shares | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Total anti-dilutive securities (in shares) | 8,313,003 | 6,578,407 | 8,313,003 | 6,578,407
Restricted Stock Units (RSUs) [Member] |  |  |  |
Total anti-dilutive securities (in shares) | 3,794,227 | 3,842,631 | 3,794,227 | 3,842,631
Share-based Payment Arrangement, Option [Member] |  |  |  |
Total anti-dilutive securities (in shares) | 2,120,000 | 2,623,776 | 2,120,000 | 2,623,776
Warrant [Member] |  |  |  |
Total anti-dilutive securities (in shares) | 2,398,776 | 112,000 | 2,398,776 | 112,000

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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://fasb.org/us-gaap/role/ref/legacyRef -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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