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Note 10 - Indebtedness (Details Textual) $ / shares in Units, $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Aug. 12, 2019 USD ($) $ / shares | Mar. 31, 2020 USD ($) | Mar. 01, 2017 USD ($)
Proceeds from Convertible Debt |  | $ 172,500 |
Convertible Debt, Noncurrent |  | $ 140,278 |
Credit Facility [Member] | Line of Credit [Member] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 80,000
The Notes [Member] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 1.375% |
Term Loan [Member] | Credit Facility [Member] |  |  |
Long-term Debt, Gross |  |  | $ 20,000
Interest and Debt Expense, Total |  | $ 238 |
Senior Notes [Member] | The Notes [Member] |  |  |
Long-term Debt, Gross |  | 172,500 |
Debt Instrument, Face Amount | $ 172,500 |  |
Debt Instrument, Underwriters' Option to Purchase, Additional Amount | 22,500 |  |
Proceeds from Convertible Debt | $ 167,070 | $ 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 |  |
Debt Instrument, Fundamental Change, Repayment Percentage of Principal and Accrued Interest | 100.00% |  |
Convertible Debt, Noncurrent | $ 141,427 |  |
Debt Instrument, Convertible, Carrying Amount of Equity Component | $ 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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