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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2021	Mar. 31, 2020
Inventory Valuation Reserves, Ending Balance	$ 1,800	$ 1,800	$ 1,300
Asset Impairment Charges, Total		0	0
Goodwill, Impairment Loss		$ 0	$ 0
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)		436,139	354,748
Foreign Currency Transaction Gain (Loss), before Tax, Total		$ 700	$ 100
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%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Fuji Bridex Pte Ltd [Member]
Concentration Risk, Percentage			25.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Department of Homeland Security [Member]
Concentration Risk, Percentage			18.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Doosan Heavy Industries Construction Co [Member]
Concentration Risk, Percentage			17.00%

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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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