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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%