Note 6 - Goodwill and Other Intangibles - Intangible Assets (Details) - USD ($) $ in Thousands	9 Months Ended
	Dec. 31, 2022	Mar. 31, 2022
Accumulated Amortization	$ (12,446)	$ (10,350)
Net Book Value	7,415
Intangible assets, gross amount	21,661	21,661
Intangible assets, net	9,215	11,311
Trade Names [Member]
Trade name and trademarks	1,800	1,800
Licensing Agreements [Member]
Gross Amount	3,610	3,610
Accumulated Amortization	(3,610)	(3,610)
Net Book Value	$ 0	0
Estimated Useful Life (Year)	7 years
Backlog [Member]
Gross Amount	$ 681	681
Accumulated Amortization	(675)	(631)
Net Book Value	$ 6	50
Estimated Useful Life (Year)	2 years
Customer Relationships [Member]
Gross Amount	$ 9,600	9,600
Accumulated Amortization	(4,413)	(2,723)
Net Book Value	$ 5,187	6,877
Estimated Useful Life (Year)	7 years
Core Technology and Know-how [Member]
Gross Amount	$ 5,970	5,970
Accumulated Amortization	(3,748)	(3,386)
Net Book Value	$ 2,222	$ 2,584
Core Technology and Know-how [Member] | Minimum [Member]
Estimated Useful Life (Year)	5 years
Core Technology and Know-how [Member] | Maximum [Member]
Estimated Useful Life (Year)	10 years