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Note 5 - Revolving Credit Facility (Details Textual) - USD ($)
$ in Millions
Jul. 05, 2016
Mar. 31, 2019
Mar. 31, 2018
Revolving Credit Facility [Member]      
Debt Instrument, Term 5 years    
Line of Credit Facility, Maximum Borrowing Capacity During Nonproduction Period   $ 400.0  
Line of Credit Facility, Maximum Borrowing Capacity During Production Period   500.0  
Long-term Line of Credit, Total   $ 155.3  
Debt, Weighted Average Interest Rate   4.00%  
Pledged Assets, Not Separately Reported, Other   $ 585.9  
Standby Letters of Credit [Member]      
Long-term Line of Credit, Total   $ 11.4 $ 10.4