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Note 4 - Short-term Borrowings (Details Textual) - USD ($)
$ in Thousands
Jul. 05, 2016
Mar. 31, 2018
Mar. 31, 2017
Pledged Assets, Not Separately Reported, Other   $ 759,600  
Notes Payable to Bank, Current   $ 166
Revolving Credit Facility [Member]      
Debt Instrument, Term 5 years    
Line of Credit Facility, Maximum Borrowing Capacity During Nonproduction Period   400,000  
Line of Credit Facility, Maximum Borrowing Capacity During Production Period   500,000  
Long-term Line of Credit, Total   $ 293,500  
Debt, Weighted Average Interest Rate   3.35%  
Standby Letters of Credit [Member]      
Long-term Line of Credit, Total   $ 10,400 $ 13,100