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Note 9 - Stock Transactions and Stock-based Compensation (Details Textual) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended | 208 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 28, 2021 | Jun. 12, 2020 | Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2023 | Nov. 30, 2005
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) |  |  |  |  |  |  |  |  | 300
Stock Repurchased During Period, Value |  |  |  |  | $ 0 | $ 0 | $ 0 |  |
Stock Repurchased During Period, Shares (in shares) |  |  |  |  |  |  |  | 162 |
Stock Issued During Period, Shares, New Issues (in shares) |  | 600 |  |  |  |  |  |  |
Sale of Stock, Underwriter Options, Shares (in shares) |  | 90 |  |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) |  | $ 225.00 |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock |  | $ 145,935 |  |  | 0 | 0 | 145,935 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value |  |  |  |  | 6,902 | 15,209 | 9,559 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested in Period, Fair Value |  |  |  |  | $ 2,763 | $ 2,856 | $ 2,005 |  |
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) |  |  |  |  | $ 185,600 | $ 268.81 | $ 226.72 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested and Expected to Vest, Outstanding, Number (in shares) |  |  | 42 |  | 42 |  |  | 42 |
Share-Based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount |  |  | $ 2,835 |  | $ 2,835 |  |  | $ 2,835 |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  |  | 1 year 8 months 12 days |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount |  |  | 6,893 |  | $ 6,893 |  |  | 6,893 |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  |  | 1 year 9 months 18 days |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) |  |  |  |  |  | $ 274.55 | $ 231.61 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value |  |  |  |  | $ 6,751 | $ 5,320 | $ 1,819 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Distributed |  |  |  |  | 5,004 | $ 5,320 | 2,429 |  |
Performance Stock Units [Member] |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount |  |  | 7,642 |  | $ 7,642 |  |  | $ 7,642 |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  |  | 3 years 4 months 24 days |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) |  |  |  |  | $ 182.14 | $ 302.15 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value |  |  |  |  | $ 1,926 | $ 5,671 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Distributed |  |  |  |  | $ 1,776 | $ 7,549 | $ 0 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  |  | 19 |  | 0 |  |
Sharebased Payment Arrangement, Expected to Vest Share, Release of Cumulative Value |  |  |  |  | $ 1,787 |  |  |  |
Sharebased Payment Arrangement, Expected to Vest Share, Release of Cumulative Value, Net of Tax |  |  |  |  | $ 1,322 |  |  |  |
Sharebased Payment Arrangement, Expected to Vest Share, Release of Cumulative Value, Per Share, Basic (in dollars per share) |  |  |  |  | $ 0.25 |  |  |  |
Share-Based Payment Arrangement, Non-cash Expense, Expected Decrease Amount Per Quarter |  |  | $ 402 |  |  |  |  |  |
Sharebased Payment Arrangement, Expected to Vest Share, Release of Cumulative Value, Per Share, Diluted (in dollars per share) |  |  |  |  | $ 0.25 |  |  |  |
Performance Stock Units [Member] | Employees of Agena [Member] |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  |  |  | 7 |  |  |
Performance Stock Units [Member] | Chief Executive Officer and Board Director [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted (in shares) | 40 |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award, Non Option Equity Instruments, Performance Period Granted (Year) | 3 years |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expected to Vest, Percentage |  |  |  | 93.00% |  |  |  |  |
Performance Stock Units [Member] | Chief Executive Officer and Board Director [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares to be Issued Upon Vesting (in shares) | 0 |  |  |  |  |  |  |  |
Performance Stock Units [Member] | Chief Executive Officer and Board Director [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares to be Issued Upon Vesting (in shares) | 40 |  |  |  |  |  |  |  |
The FY23 PSUs Member | Eligible Employees [Member] |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) |  |  | 19 |  | 19 |  |  | 19 |
The FY23 PSUs Member | Eligible Employees [Member] | Vesting Based on Achievement of Specific Performance Criteria [Member] |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) |  |  |  |  | $ 185.57 |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  |  | 13 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested and Expected to Vest, Outstanding, Number (in shares) |  |  | 0 |  | 0 |  |  | 0 |
The 2021 Equity Plan [Member] |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) |  |  | 330 |  | 330 |  |  | 330 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) |  |  | 145 |  | 145 |  |  | 145 |
Equity Plan 2014 [Member] |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) |  |  | 95 |  | 95 |  |  | 95 |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) |  |  | 1,100 |  | 1,100 |  |  | 1,100 |
Equity Plan 2014 [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) |  |  |  |  | $ 187.21 |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  |  | 43 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested and Expected to Vest, Outstanding, Number (in shares) |  |  | 53 |  | 53 |  |  | 53 |

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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Number of shares authorized for issuance under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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