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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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