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Note 10 - Per Share Data (Tables) | 6 Months Ended
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Jun. 30, 2020
Notes Tables |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Net income/(loss) for basic earnings per share |  | $ | 20,890,158 |  |  | $ | (3,162,492 | ) |  | $ | 11,992,629 |  |  | $ | (1,532,715 | )
Less: Change in fair value of warrants |  |  | — |  |  |  | 656,523 |  |  |  | — |  |  |  | 3,792,788 |
Net income/(loss), adjusted for change in fair value of warrants for diluted earnings per share |  | $ | 20,890,158 |  |  | $ | (3,819,015 | ) |  | $ | 11,992,629 |  |  | $ | (5,325,503 | )
Weighted-average shares |  |  | 80,340,695 |  |  |  | 80,986,524 |  |  |  | 80,790,400 |  |  |  | 80,950,124 |
Effect of potential common shares |  |  | 176,168 |  |  |  | 1,128,137 |  |  |  | 169,412 |  |  |  | 1,179,477 |
Weighted-average shares: diluted |  |  | 80,516,863 |  |  |  | 82,114,661 |  |  |  | 80,959,812 |  |  |  | 82,129,601 |
Income/(loss) per share: basic |  | $ | 0.26 |  |  | $ | (0.04 | ) |  | $ | 0.15 |  |  | $ | (0.02 | )
Income/(loss) per share: diluted |  | $ | 0.26 |  |  | $ | (0.05 | ) |  | $ | 0.15 |  |  | $ | (0.06 | )
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] |
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2019 |  |  | 2019 |
Stock options |  |  | 352,015 |  |  |  | 364,444 |
Stock-settled stock appreciation rights |  |  | — |  |  |  | 3,359 |
Restricted stock units |  |  | 527,082 |  |  |  | 518,295 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + 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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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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