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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