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Note 6 - Indebtedness (Details Textual) |  |  | 9 Months Ended |
--- | --- | --- | --- | ---
Aug. 12, 2019 USD ($) $ / shares | Mar. 01, 2017 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Mar. 31, 2019 USD ($)
Proceeds from Convertible Debt |  |  | $ 167,070,000 |  |
Convertible Debt, Noncurrent |  |  | 138,967,000 |  |
Credit Facility [Member] | Term Loan [Member] |  |  |  |  |
Long-term Debt, Gross |  | $ 20,000,000 |  |  |
Interest and Debt Expense, Total |  |  | 238,000 |  |
The Notes [Member] | Senior Notes [Member] |  |  |  |  |
Debt Instrument, Term | 6 years |  |  |  |
Long-term Debt, Gross |  |  | 172,500,000 |  |
Proceeds from Convertible Debt | $ 172,500,000 |  | $ 172,500,000 |  |
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 | $ / 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 | $ 141,427,000 |  |  |  |
Debt Instrument, Convertible, Carrying Amount of Equity Component | 31,073,000 |  | $ 31,073,000 |  |
Debt Instrument, Unamortized Discount and Commissions Including Equity Component | 5,175,000 |  |  |  |
Third Party Offering Costs | 255,000 |  |  |  |
Debt Issuance Costs, Gross | $ 4,452,000 |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 5.50% |  |  |  |
Line of Credit [Member] | Credit Facility [Member] |  |  |  |  |
Debt Instrument, Term |  | 5 years |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 80,000,000 |  |  |
Line of Credit Facility, Additional Maximum Borrowing Capacity |  | 100,000,000 |  |  |
Letter of Credit [Member] | Credit Facility [Member] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 2,500,000 |  |  |

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