The number of shares that can be granted upon exercise of underwriter options.

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Represents the performance period of the shared based compensation arrangement.

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Represents the expected number of performance service unit ("PSU") shares that will vest in future reporting periods.

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Number of fully vested and expected to vest equity instruments other than options outstanding that can be converted into shares

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The percentage of shares will be issued upon vesting.

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The amount of share-based compensation cumulative true-up expense.

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Represents true up of vested share value for share based payment arrangement.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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The cash inflow from the additional capital contribution to the entity.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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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.

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Net number of non-option equity instruments granted to participants.

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Number of shares authorized for issuance under share-based payment arrangement.

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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.

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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.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Per share or per unit amount of equity securities issued.

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Number of new stock issued during the period.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Note 9 - Stock Transactions and Stock-based Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands				3 Months Ended			12 Months Ended			196 Months Ended
	Oct. 28, 2021	Jun. 12, 2020	Aug. 12, 2019	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2022	Nov. 30, 2005
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares)											300,000,000
Stock Repurchased During Period, Value							$ 0	$ 0	$ 0
Stock Repurchased During Period, Shares (in shares)										162,000
Stock Issued During Period, Shares, New Issues (in shares)		600,000	431,000
Sale of Stock, Underwriter Options, Shares (in shares)		90,000	56,000
Shares Issued, Price Per Share (in dollars per share)		$ 225.00	$ 210.00
Proceeds from Issuance of Common Stock		$ 145,935	$ 84,995				0	145,935	84,995
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value							15,209	9,559	9,574
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total									3,915
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested in Period, Fair Value							$ 2,856	$ 2,005	$ 1,912
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)				$ 268,810				$ 226.72	$ 206.35
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested and Expected to Vest, Outstanding, Number (in shares)				53,000			53,000			53,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Ending Balance (in dollars per share)				$ 288.45			$ 288.45			$ 288.45
Share-Based Payment Arrangement, Option [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)							1 year 9 months 18 days
Restricted Stock Units (RSUs) [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total								$ 7,942
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested and Expected to Vest, Outstanding, Number (in shares)				48			48			48
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Ending Balance (in dollars per share)				$ 251.94			$ 251.94			$ 251.94
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)								$ 231.61	$ 213.31
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value							$ 5,320	$ 1,819	$ 959
Restricted Stock Units (RSUs) [Member] \| Chief Executive Officer [Member]
Share-based Compensation Expense, Cumulative True-up						$ 351
Restricted Stock Units (RSUs) [Member] \| Chief Executive Officer [Member] \| Share-Based Payment Arrangement, Tranche One [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)						1,000
Performance Stock Units [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total				$ 11,651			$ 11,651			$ 11,651
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)							2 years 9 months 18 days
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Ending Balance (in dollars per share)								$ 207.88
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)							$ 302.15		$ 215.47
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)							48,000	0
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)							29,000	0	0
Performance Stock Units [Member] \| Employees of Agena [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested and Expected to Vest, Outstanding, Number (in shares)				4			4	8		4
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Ending Balance (in dollars per share)					$ 305.79
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)					7,000
Performance Stock Units [Member] \| Employees of Agena [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award Number of Shares Issued Upon Vesting, Percentage					50.00%
Performance Stock Units [Member] \| Employees of Agena [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award Number of Shares Issued Upon Vesting, Percentage					200.00%
Share-based Payment Arrangement, True Up of Vested Share Value				$ 295
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)	40,000
Share Based Compensation Arrangement By Share Based Payment Award, Non Option Equity Instruments, Performance Period Granted (Year)	3 years
The FY20 PSUs [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total				$ 129			$ 129			$ 129
Share-based Payment Arrangement, True Up of Vested Share Value							$ 650
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Expected to Vest (in shares)				9			9	6		9
The FY20 PSUs [Member] \| Eligible Employees [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)									$ 202.00
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)									3 years
The FY20 PSUs [Member] \| Eligible Employees [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award Number of Shares Issued Upon Vesting, Percentage									0.00%
The FY20 PSUs [Member] \| Eligible Employees [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award Number of Shares Issued Upon Vesting, Percentage									200.00%
The 2021 Equity Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)				330,000			330,000			330,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)				203,000			203,000			203,000
Equity Plan 2014 [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)				1,100,000			1,100,000			1,100,000
Equity Plan 2014 [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)							3 years
Equity Plan 2014 [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)							5 years
Equity Plan 2014 [Member] \| Restricted Stock Units (RSUs) [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Ending Balance (in dollars per share)				$ 252.86			$ 252.86	$ 206.56		$ 252.86
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
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)							37,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)							20,000