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Note 11 - Fair Value of Financial Instruments (Details Textual) - USD ($)
Jun. 30, 2018
Mar. 31, 2018
Long-term Debt, Gross $ 331,095,000 $ 417,834,000
Long-term Debt, Fair Value 330,681,000 417,485,000
Capital Lease Obligations, Total 39,448,000 42,009,000
Capital Lease Obligations, Fair Value Disclosure $ 36,362,000 $ 39,023,000