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Note 7 - Indebtedness (Details Textual) $ / shares in Units, $ in Thousands | Aug. 12, 2019 USD ($) $ / shares | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($)
--- | --- | --- | ---
Convertible Debt, Noncurrent |  | $ 141,604 | $ 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%
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 Carrying amount of long-term convertible debt as of the balance sheet date, net of the amount due in the next twelve months or greater than the normal operating cycle, if longer. The debt is convertible into another form of financial instrument, typically the entity's common stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + 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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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6036836-161870 Reference 2: 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 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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