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Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ / shares in Thousands, $ in Thousands	Dec. 31, 2022	Mar. 31, 2022
Allowance for doubtful accounts receivable	$ 758	$ 630
Property, plant and equipment, accumulated Depreciation	$ 19,708	$ 17,726
Common stock, par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized (in shares)	25,000,000	25,000,000
Common stock, shares issued (in shares)	5,341,890	5,265,627
Common stock, shares outstanding (in shares)		5,265,627

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount of allowance for credit loss on accounts receivable, classified as current.

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