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Note 13 - Fair Value of Financial Instruments (Details Textual) - USD ($)
Sep. 28, 2019
Mar. 31, 2019
Sep. 29, 2018
Long-term Debt, Gross $ 243,978,000 $ 266,245,000 $ 354,398,000
Long-term Debt, Fair Value $ 243,903,000 $ 266,140,000 $ 354,304,000