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Note 6 - Long-term Debt (Details Textual) - USD ($)
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Jun. 29, 2019
Dec. 09, 2016
Long-term Debt, Total $ 266,245,000 $ 409,396,000    
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments without Regulatory Approval   50,000    
Dividends, Preferred Stock, Cash   23,000    
Pledged Assets Not Separately Reported, Fixed Assets 633,200,000      
Tax-exempt Bond [Member]        
Long-term Debt, Total 10,000,000 $ 9,983,000    
Term Loan Payable to Farm Credit East ACA [Member]        
Other Loans Payable, Long-term, Noncurrent       $ 100,000,000
Debt Instrument, Unamortized Discount, Total       $ 200,000
Debt Instrument, Maintain Minimum Amount of Excess Availability On Revolver Facility $ 175,000,000      
Term Loan Payable to Farm Credit East ACA [Member] | Forecast [Member]        
Debt Instrument, Maintain Minimum Amount of Excess Availability On Revolver Facility     $ 175,000,000