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Note 6 - Indebtedness (Details Textual)
3 Months Ended 6 Months Ended
Aug. 12, 2019
USD ($)
$ / shares
Mar. 01, 2017
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Mar. 31, 2019
USD ($)
Proceeds from Convertible Debt       $ 167,070,000  
Convertible Debt, Noncurrent     $ 137,682,000 137,682,000    
Credit Facility [Member]            
Debt Instrument Convenant, Maximum Leverage Ratio, During the Initial Holiday Period   3.5        
Debt Instrument Covenant, Maximum Leverage Ratio, Immediately Following the Initial Holiday Period   3.25        
Debt Instrument Covenant, Fixed Charge Coverage Ratio   1.25        
Credit Facility [Member] | After March 31, 2016 [Member]            
Debt Instrument Covenant, Ratio of Funded Debt to Consolidated EBITDA   3        
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     172,500,000 172,500,000  
Proceeds from Convertible Debt $ 172,500,000   172,500,000      
Debt Instrument, Interest Rate, Stated Percentage 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 $ 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]            
Long-term Debt, Gross   $ 20,000,000        
Line of Credit [Member] | Minimum [Member]            
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage   0.15%        
Line of Credit [Member] | Maximum [Member]            
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage   0.35%        
Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]            
Debt Instrument, Basis Spread on Variable Rate   1.50%        
Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]            
Debt Instrument, Basis Spread on Variable Rate   2.50%        
Line of Credit [Member] | Debt Instrument, Variable Rate Base CBFR Using One Month LIBOR [Member]            
Debt Instrument, Basis Spread on Variable Rate Used to Calculate Commercial Bank Floating Rate   0.50%        
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