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Note 8 - Stockholders' Equity (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands

3 Months Ended

9 Months Ended

12 Months Ended

Oct. 28, 2021

Dec. 31, 2022

Dec. 31, 2022

Mar. 31, 2022

The FY20 PSUs [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Vested, Percentage of Finance Performance Target

126.00%

The FY23 PSUs Member | Eligible Employees [Member]

Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)

19,000

19,000

Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)

13,000

Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested 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, Nonvested, Number, Ending Balance (in shares)

6,000

6,000

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)

$ 166.21

$ 166.21

The FY23 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 FY23 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%

Performance Stock Units [Member]

Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)

10

Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value (in dollars per share)

$ 202.00

Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)

^[1]

66

^[2]

66

^[2]

55

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)

^[1]

$ 267.97

$ 267.97

$ 288.45

Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)

^[1]

19

Sharebased Payment Arrangement, Expected to Vest Share, Release of Cumulative Value

$ 1,427

Sharebased Payment Arrangement, Expected to Vest Share, Release of Cumulative Value, Net of Tax

$ 1,127

Sharebased Payment Arrangement, Expected to Vest Share, Release of Cumulative Value, Per Share, Basic (in dollars per share)

$ 0.21

$ 0.21

Share-Based Payment Arrangement, Non-cash Expense, Expected Decrease Amount Per Quarter

$ 392

Sharebased Payment Arrangement, Expected to Vest Share, Release of Cumulative Value, Per Share, Diluted (in dollars per share)

$ 0.21

$ 0.21

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)

7,000

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, Expected to Vest, Percentage

93.00%

The 2021 Equity Plan [Member]

Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)

330,000

330,000

[1]	Balances for PSUs are reflected at target.
[2]	During the nine months ended December 31, 2022, the fiscal year 2020 PSUs vested and were distributed at 126% of target, based on actual performance results and completion of service conditions.

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