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Note 7 - Indebtedness (Details Textual) $ / shares in Units, $ in Thousands | Aug. 12, 2019 USD ($) $ / shares | Dec. 31, 2020 USD ($) | Sep. 30, 2020 | Mar. 31, 2020 USD ($) | Dec. 31, 2019
--- | --- | --- | --- | --- | ---
Convertible Debt, Noncurrent |  | $ 144,302 |  | $ 140,278 |
The Notes [Member] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 1.375%
The Notes [Member] | Senior Notes [Member] |  |  |  |  |
Debt Instrument, Face Amount | $ 172,500 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.375% |  | 1.375% | 1.375% |
Debt Instrument, Convertible, Conversion Ratio Per 1,000 Principal | 3.5273 |  |  |  |
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares | $ 283.50 |  |  |  |
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger | 130.00% |  |  |  |
Debt Instrument, Convertible, Threshold Trading Days | 20 |  |  |  |
Debt Instrument, Convertible, Threshold Consecutive Trading Days | 30 |  |  |  |
Debt Instrument, Convertible, Consecutive Trading Days, Trading Price Per 1,000 Principal of Notes Less Than 98% of the Product | 10 |  |  |  |
Convertible Debt, Noncurrent | $ 141,427 |  |  |  |
Debt Instrument, Convertible, Carrying Amount of Equity Component | $ 31,073 | $ 31,073 |  | $ 31,073 |
Debt Instrument, Term (Year) | 6 years |  |  |  |
Debt Instrument, Unamortized Discount and Commissions Including Equity Component | $ 5,175 |  |  |  |
Third Party Offering Costs | 255 |  |  |  |
Debt Issuance Costs, Gross | $ 4,452 |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 5.50% |  |  |  |

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- Definition Threshold period of specified consecutive trading days within which common stock price to $1,000 principal of convertible debt instrument must be less than 98% of the product of the last reported sale price per share of common stock. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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