Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	12 Months Ended
Mar. 31, 2023	Mar. 31, 2022
Inventory Valuation Reserves	$ 1,500	$ 1,900
Asset Impairment Charges	0	0
Goodwill, Impairment Loss	0	0
Revenue from Contract with Customer, Including Assessed Tax	$ 105,984	$ 108,435
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	1,421,771	1,495,402
Gain (Loss), Foreign Currency Transaction, before Tax	$ 100	$ 100
Derivative [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	1,000,000.0	1,000,000.0
Held Transactions [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 600	$ 1,200
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Anovion LLC [Member]
Concentration Risk, Percentage	21.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Fuji Bridex Pte Ltd [Member]
Concentration Risk, Percentage	15.00%	31.00%

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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