Note 8 - Goodwill and Long-Lived Assets - Other Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Carrying Amount	$ 176,866	$ 169,123
Accumulated Amortization	(65,125)	(49,252)
Net	$ 111,741	119,871
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	5 years
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	15 years
Intellectual Property [Member]
Carrying Amount	$ 21,201	15,731
Accumulated Amortization	(8,595)	(6,454)
Net	$ 12,606	9,277
Weighted average remaining life (Year)	8 years 4 months 24 days
Intellectual Property [Member] \| Minimum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	10 years
Intellectual Property [Member] \| Maximum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	15 years
Trade Names [Member]
Carrying Amount	$ 8,612	5,839
Accumulated Amortization	(3,129)	(2,855)
Net	$ 5,483	2,984
Weighted average remaining life (Year)	4 years 3 months 18 days
Trade Names [Member] \| Minimum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	5 years
Trade Names [Member] \| Maximum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	10 years
Customer Relationships [Member]
Carrying Amount	$ 145,754	146,106
Accumulated Amortization	(52,206)	(38,777)
Net	$ 93,548	107,329
Weighted average remaining life (Year)	8 years 6 months
Customer Relationships [Member] \| Minimum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	5 years
Customer Relationships [Member] \| Maximum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	10 years
Noncompete Agreements [Member]
Carrying Amount	$ 1,299	1,447
Accumulated Amortization	(1,195)	(1,166)
Net	$ 104	$ 281
Weighted average remaining life (Year)	2 years
Noncompete Agreements [Member] \| Minimum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	5 years
Noncompete Agreements [Member] \| Maximum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	10 years

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 926
-SubTopic 20
-Section 50
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