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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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