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Note 9 - Retirement Plans - Pension and Post Retirement Plan Adjustments (Details) $ in Thousands | 12 Months Ended
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Mar. 31, 2018 USD ($)
Balance | $ 425,204
Balance | 396,930
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |
Balance | (11,175)
Other comprehensive loss before reclassifications | (11,483)
Reclassified of certain tax effects of accumulated other comprehensive loss in connection with the new Tax Cuts and Jobs Act | (2,409)
Net current period other comprehensive loss | (13,892)
Balance | $ (25,067)

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