Note 2 - Revenue Recognition (Details Textual) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
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| Accrued Trade Promotions | $ 6.2 | $ 7.0 |
| Contract with Customer, Asset, after Allowance for Credit Loss, Current | $ 1.2 | $ 1.1 |
| Product Concentration Risk [Member] | Revenue Benchmark [Member] | Food Packaging [Member] | ||
| Concentration Risk, Percentage | 98.00% |
| X | ||||||||||
- Definition Carrying value as of the balance sheet date of obligations incurred for trade promotions. No definition available.
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| X | ||||||||||
- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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