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Note 4 - Significant Transactions (Details Textual) - USD ($) $ in Thousands				5 Months Ended	12 Months Ended
		Jun. 30, 2021	Oct. 31, 2019	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Asset Impairment Charges, Total					$ 0	$ 298	$ 4,774
Payments to Acquire Businesses, Gross					(0)	184,102	4,840
Amortization of Intangible Assets, Total					14,513	10,637	7,090
Depreciation, Total					2,959	2,234	2,338
Amortization of Inventory Step-up Cost					(436)	8,502	0
Goodwill, Ending Balance				$ 141,536	160,841	141,536	66,377
Payment for Contingent Consideration Liability, Financing Activities					304	11	680
GPT Acquisition [Member]
Business Acquisition, Percentage of Voting Interests Acquired			100.00%
Payments to Acquire Businesses, Gross			$ 181,547
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles					(6,002)
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Inventory					(3,752)
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment					878
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Accrued Expenses					1,899
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accounts Receivable					500
Amortization of Intangible Assets, Total					(344)	8,930
Inventory Step-up Cost			$ 8,066				8,066
Amortization of Inventory Step-up Cost				$ 8,502	(436)		8,596
Goodwill, Ending Balance	[1]				85,130
Business Combination, Acquisition Related Costs					1,399
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual					33,892
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual					(9,006)
Business Combination, Pro Forma Information, Gain (Loss) in Amortization of Intangible Assets of Acquiree since Acquisition Date, Actual					8,900
Business Combination, Pro Forma Information, Realized and Unrealized Gain (Loss) of Acquiree since Acquisition Date, Actual					$ 3,000
Effective Income Tax Rate Reconciliation, Percent, Total					25.00%
GPT Acquisition [Member] | Customer Relationships [Member]
Finite-Lived Intangible Asset, Useful Life (Year)					10 years
IBP Acquisition [Member]
Payment for Contingent Consideration Liability, Financing Activities					$ 296
IBP Acquisition [Member] | Forecast [Member]
Payment for Contingent Consideration Liability, Financing Activities		$ 237
Gas Flow Calibration and Air Sampling Equipment [Member] | Post Employment Benefits [Member]
Restructuring and Related Cost, Expected Cost Remaining					317
Cold Chain Packaging [Member]
Asset Impairment Charges, Total						276	4,774
Cold Chain Packaging [Member] | Employee Severance and Facility Closure [Member]
Restructuring Charges, Total						$ 51	$ 150
Cost of Revenues, Selling and Administrative Expense [Member] | Gas Flow Calibration and Air Sampling Equipment [Member] | Facility Closing [Member]
Restructuring Charges, Total					588
Cost of Revenues, Selling and Administrative Expense [Member] | Gas Flow Calibration and Air Sampling Equipment [Member] | Employee Severance [Member]
Restructuring Charges, Total					335
Cost of Revenues, Selling and Administrative Expense [Member] | Gas Flow Calibration and Air Sampling Equipment [Member] | Other Restructuring [Member]
Restructuring Charges, Total					248
General and Administrative Expense [Member] | GPT Acquisition [Member]
Amortization of Intangible Assets, Total					(522)
Depreciation, Total					207
General and Administrative Expense [Member] | Biopharmaceutical Development [Member] | GPT Acquisition [Member]
Amortization of Intangible Assets, Total					7,487
Cost of Sales [Member] | GPT Acquisition [Member]
Amortization of Intangible Assets, Total					178
Cost of Sales [Member] | Biopharmaceutical Development [Member] | GPT Acquisition [Member]
Amortization of Intangible Assets, Total					$ 1,430
[1] Acquired goodwill of $85,130, all of which is allocated to the Biopharmaceutical Development reportable segment, represents the value expected to arise from projected organic revenues growth that is expected to exceed that of our legacy divisions, and the value expected to arise from the opportunity to expand into a new market with well-established market share. The goodwill acquired is not deductible for income tax purposes.

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