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Note 2 - Revenue Recognition (Details Textual) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024
Accrued Trade Promotions | $ 7.0 | $ 10.0
Contract with Customer, Asset, after Allowance for Credit Loss, Current | $ 1.1 | $ 0.4
Product Concentration Risk [Member] | Revenue Benchmark [Member] | Food Packaging [Member] |  |
Concentration Risk, Percentage | 98.00% |

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