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Note 14 - Weighted Average Shares Outstanding and Net Income (Loss) Per Share (Details Textual) - $ / shares | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Nov. 30, 2019
Share Price, Potential Dilutive Effect (in dollars per share) |  | $ 31.47 |  |  |
The 2.75% Convertible Notes [Member] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.75% | 2.75% | 2.75% | 2.75% | 2.75%
Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | 636,000 |  | 580,000 |  |

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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://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=124432515&loc=d3e3550-109257 + Details
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