Note 1 - Basis of Presentation (Details Textual)	9 Months Ended
Dec. 31, 2018
Stock Rotation Program, Percentage of Previous Six Months Net Sales	5.00%

Stock rotation is a program whereby distributor customers are allowed to return for credit qualified inventory, semi-annually, equal to a certain percentage, primarily limited to 5% of the previous six months net sales.

No definition available.

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Period Type:	duration