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Note 12 - Significant Transactions (Details Textual) - USD ($) $ in Thousands			3 Months Ended		5 Months Ended	6 Months Ended
	Oct. 31, 2019		Sep. 30, 2020	Sep. 30, 2019	Mar. 31, 2020	Sep. 30, 2020	Sep. 30, 2019
Payments to Acquire Businesses, Gross						$ (0)	$ 2,555
Amortization of Intangible Assets, Total			$ 3,512	$ 1,658		6,866	3,330
Amortization of Inventory Step-up Cost						(436)	0
Goodwill, Ending Balance			156,365		$ 141,536	156,365
Share-based Payment Arrangement, Expense			$ 2,008	$ 1,182		$ 3,276	$ 2,050
Effective Income Tax Rate Reconciliation, Percent, Total			(12.40%)	16.00%		(24.20%)	14.80%
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, Deferred Tax Liabilities						2,010
Amortization of Intangible Assets, Total						(344)	$ 4,057
Inventory Step-up Cost	8,066
Amortization of Inventory Step-up Cost					$ 8,502	(436)
Goodwill, Ending Balance	84,028	[1]	$ 84,028			84,028
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual						15,080
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual						$ (2,083)
Effective Income Tax Rate Reconciliation, Percent, Total							25.00%
GPT Acquisition [Member] | Key GPT Employees [Member] | Performance Stock Units [Member]
Share-based Payment Arrangement, Expense							$ 351
GPT Acquisition [Member] | Customer Relationships [Member]
Finite-Lived Intangible Asset, Useful Life (Year)						10 years
GPT Acquisition [Member] | Technology-Based Intangible Assets [Member]
Finite-Lived Intangible Asset, Useful Life (Year)						10 years
GPT Acquisition [Member] | Cost of Sales [Member]
Amortization of Intangible Assets, Total						$ 178
GPT Acquisition [Member] | General and Administrative Expense [Member]
Amortization of Intangible Assets, Total						(522)
Depreciation, Total			$ 207
GPT Acquisition [Member] | General and Administrative Expense [Member] | Biopharmaceutical Development [Member]
Amortization of Intangible Assets, Total	$ 473					$ 1,409
[1] Acquired goodwill of [$84,028], all of which is allocated to the Biopharmaceutical Development reportable segment, represents the value expected to arise from organic revenues growth projections that are expected to exceed that of our legacy divisions, and 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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