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Note 5 - Goodwill and Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Carrying Amount	$ 77,113	$ 64,852
Accumulated Amortization	(34,263)	(27,062)
Net	$ 42,850	37,790
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life	3 years
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life	16 years
Intellectual Property [Member]
Carrying Amount	$ 7,210	7,210
Accumulated Amortization	(4,554)	(3,824)
Net	$ 2,656	$ 3,386
Intellectual Property [Member] | Minimum [Member]
Finite-Lived Intangible Asset, Useful Life	10 years	10 years
Intellectual Property [Member] | Maximum [Member]
Finite-Lived Intangible Asset, Useful Life	16 years	16 years
Trade Names [Member]
Carrying Amount	$ 3,675	$ 3,663
Accumulated Amortization	(2,154)	(1,727)
Net	$ 1,521	$ 1,936
Trade Names [Member] | Minimum [Member]
Finite-Lived Intangible Asset, Useful Life	3 years	3 years
Trade Names [Member] | Maximum [Member]
Finite-Lived Intangible Asset, Useful Life	10 years	10 years
Customer Relationships [Member]
Carrying Amount	$ 64,363	$ 52,134
Accumulated Amortization	(26,128)	(20,260)
Net	$ 38,235	$ 31,874
Customer Relationships [Member] | Minimum [Member]
Finite-Lived Intangible Asset, Useful Life	7 years	7 years
Customer Relationships [Member] | Maximum [Member]
Finite-Lived Intangible Asset, Useful Life	10 years	10 years
Noncompete Agreements [Member]
Carrying Amount	$ 1,865	$ 1,845
Accumulated Amortization	(1,427)	(1,251)
Net	$ 438	$ 594
Noncompete Agreements [Member] | Minimum [Member]
Finite-Lived Intangible Asset, Useful Life	3 years	3 years
Noncompete Agreements [Member] | Maximum [Member]
Finite-Lived Intangible Asset, Useful Life	10 years	10 years

X

- Definition

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.

+ Details

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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X

- 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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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