Note 11 - Acquisitions - Acquired Intangible Assets (Details) - USD ($) $ in Thousands	Oct. 01, 2020	Nov. 12, 2019	Aug. 08, 2019	Apr. 01, 2019	Nov. 11, 2019	Aug. 07, 2019	Mar. 31, 2019
Astero [Member]
Intangible assets				$ 4,120
Astero [Member] | Customer Relationships [Member]
Intangible assets				$ 160			$ 160
Intangible assets, estimated useful life (Year)				4 years
Astero [Member] | Trade Names [Member]
Intangible assets				$ 470			470
Intangible assets, estimated useful life (Year)				9 years
Astero [Member] | Developed Technology Rights [Member]
Intangible assets				$ 2,840			2,840
Astero [Member] | Developed Technology Rights [Member] | Minimum [Member]
Intangible assets, estimated useful life (Year)				5 years
Astero [Member] | Developed Technology Rights [Member] | Maximum [Member]
Intangible assets, estimated useful life (Year)				9 years
Astero [Member] | In Process Research and Development [Member]
Intangible assets				$ 650			$ 650
SAVSU [Member]
Intangible assets			$ 12,150
SAVSU [Member] | Customer Relationships [Member]
Intangible assets			$ 80			$ 80
Intangible assets, estimated useful life (Year)			6 years
SAVSU [Member] | Trade Names [Member]
Intangible assets			$ 1,320			1,320
Intangible assets, estimated useful life (Year)			9 years
SAVSU [Member] | Developed Technology Rights [Member]
Intangible assets						$ 10,750
SAVSU [Member] | Technology-Based Intangible Assets [Member]
Intangible assets			$ 10,750
SAVSU [Member] | Technology-Based Intangible Assets [Member] | Minimum [Member]
Intangible assets, estimated useful life (Year)			7 years
SAVSU [Member] | Technology-Based Intangible Assets [Member] | Maximum [Member]
Intangible assets, estimated useful life (Year)			8 years
CBS Acquisition [Member]
Intangible assets		$ 6,790
CBS Acquisition [Member] | Customer Relationships [Member]
Intangible assets		$ 560			$ 560
Intangible assets, estimated useful life (Year)		6 years
CBS Acquisition [Member] | Trade Names [Member]
Intangible assets		$ 800			800
Intangible assets, estimated useful life (Year)		6 years
CBS Acquisition [Member] | Developed Technology Rights [Member]
Intangible assets		$ 5,430			$ 5,430
Intangible assets, estimated useful life (Year)		9 years
SciSafe Holdings, Inc [Member]
Intangible assets	$ 12,100
SciSafe Holdings, Inc [Member] | Customer Relationships [Member]
Intangible assets	$ 7,420
Intangible assets, estimated useful life (Year)	14 years
SciSafe Holdings, Inc [Member] | Trade Names [Member]
Intangible assets	$ 4,020
Intangible assets, estimated useful life (Year)	19 years
SciSafe Holdings, Inc [Member] | Noncompete Agreements [Member]
Intangible assets	$ 660
Intangible assets, estimated useful life (Year)	4 years