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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2022 | Mar. 31, 2021
Inventory Valuation Reserves | $ 1,900 | $ 1,800 | $ 1,900 | $ 1,800
Asset Impairment Charges, Total |  |  | 0 | 0
Goodwill, Impairment Loss |  |  | 0 | 0
Revenue from Contract with Customer, Including Assessed Tax | $ 108,435 | $ 87,125 | $ 108,435 | $ 87,125
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) |  |  | 495,402 | 436,139
Foreign Currency Transaction Gain (Loss), before Tax, Total |  |  | $ 100 | $ 700
Held Transactions [Member] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  | $ 1,200 | $ 0
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Fuji Bridex Pte Ltd [Member] |  |  |  |
Concentration Risk, Percentage |  |  | 31.00% |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Naval Surface Warfare Center [Member] |  |  |  |
Concentration Risk, Percentage |  |  |  | 28.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | RWE Renewables [Member] |  |  |  |
Concentration Risk, Percentage |  |  |  | 11.00%

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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