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Note 3 - Revenue Recognition (Details Textual) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022
Contract with Customer, Asset, after Allowance for Credit Loss, Current | $ 0.6 | $ 0.9
Product Concentration Risk [Member] | Revenue Benchmark [Member] | Food Packaging [Member] |  |
Concentration Risk, Percentage | 98.00% |

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